Sample records for del na proveniente

  1. (CALIDAD DEL GUANO PROVENIENTE DEL MURCIELAGO Hipposideros speoris)

    Microsoft Academic Search

    K. R. Sridhar; K. M. Ashwini; S. Seena; K. S. Sreepada

    SUMMARY This study aimed at assessing the physicochemical characteristics, microflora and manure quality of guano of an endemic insectivorous cave bat Hipposideros speoris. The impact of bat guano on crop growth was also assessed. Results indicated that organic matter, total carbon, total nitrogen and phosphate were high in faecal pellets. Calcium, magnesium, bacteria, actinomycetes and fungi were higher in humus-like

  2. O ADUBO ORGÂNICO PROVENIENTE DE ESTAÇÕES DE TRATAMENTO DE ESGOTO: QUESTÕES TÉCNICAS E TENDÊNCIAS DE MERCADO

    Microsoft Academic Search

    Irene Domenes Zapparoli; Marcia Goncalves Pizaia

    2008-01-01

    O adubo orgânico, proveniente de resíduos sólidos de estações de tratamento de esgoto, biossólido, vem sendo estudado há aproximadamente duas décadas quanto aos aspectos metodológicos, tecnológicos, sanitários, agronômicos e sócio-econômicos. Nesse sentido, este estudo se prende as questões sócio-econômicas do biossólido, de forma a estudar a capacidade assimilativa do adubo, como bem o aspecto econômico em conformidade à com a

  3. UN REGALO PARA HISTORIA. A CMERA DE UM "TIGRE DO SAARA" RETRATA TEMPOS DE ESCURIDO NA REPBLICA ORIENTAL DEL URUGUAY.

    E-print Network

    Paris-Sud XI, Université de

    González. El fotógrafo nacido en Marruecos en la época del protectorado español, llegó a Uruguay como sacar la foto. Cuando el inspector José Luis Tellechea me vió disparó su revólver. Yo me tiré al suelo

  4. CP Violation and K0 decays revelation: study and simulation of neutral Trigger in NA48 experiment -- Violazione di CP e rivelazione dei decadimenti del K0: studio e simulazione del Trigger neutro nell'esperimento NA48

    E-print Network

    Federico Calzolari

    2007-01-15

    At the INFN laboratory in Pisa I have prepared my dissertation, which essentially concerned Montecarlo simulation of subnuclear particles decays and investigation of low-noise electronic devices for analyzing high-frequency signals. The team-work was part of NA48/EPSI experiment jointly carried out with European Organization for Nuclear Research CERN, Geneva. ----- Nell'ambito dell'esperimento NA48 in corso al CERN Super Proton Syncrothon (SPS) finalizzato a misurare la violazione diretta di CP in sistemi di particelle K0 attraverso il doppio rapporto R = [N(K_L->Pi0Pi0)]/[N(K_S->Pi0Pi0)] / [N(K_L->Pi+Pi-)]/[N(K_S->Pi+Pi-)] = 1 - 6 Re(e1/e) con una precisione di Re(e1/e) superiore a 2 * 10^-4, il lavoro di tesi si propone di effettuare una simulazione per la rivelazione dei decadimenti neutri dei K0 ed una successiva analisi dei dati raffrontando l'evento fisico generato con metodo Montecarlo e quello ricostruito. Per la misura di e1/e occorre isolare tra i vari modi di decadimento dei K quelli K_S->Pi0Pi0, K_S->Pi+Pi-, e quelli K_L->Pi0Pi0, K_L->Pi+Pi-.

  5. NATURAL GEOGRAPHY IN NEARSHORE AREAS (NaGISA): THE NEARSHORE COMPONENT OF THE CENSUS OF MARINE LIFE GEOGRAFIA NATURAL EN AREAS COSTERAS (NaGISA): EL COMPONENTE COSTERO DEL CENSO DE LA VIDA MARINA

    Microsoft Academic Search

    Katrin Iken; Brenda Konar

    The Natural Geography in Shore Areas (NaGISA, the Japanese word for beach) project is the nearshore component of the Census of Marine Life program. NaGISA targets nearshore marine biodiversity in large macrophyte communities (hard bottom macroalgal communities and soft sediment sea grass beds) in a depth zonation from high intertidal to 15 m water depth. The overall goal of NaGISA

  6. Un estudio de las potencialidades del mercado para el consumo de agua purificada de la fuente de Azinyahualco

    Microsoft Academic Search

    Agustín Santiago; Octaviano Juárez; Carlos Bouza

    2008-01-01

    Actualmente la comercialización del agua embotellada ha cobrado importancia en la mayoría de países de América latina, realizando fuertes inversiones en su desarrollo tanto el capital transnacional como los capitales nativos. El presente trabajo presenta un estudio de mercado solicitado por los ejidatarios del poblado Azinyahualco, Municipio de Chilpancingo, estado de Guerrero, México. Dichos ejidatarios pretenden comercializar el agua proveniente

  7. Gestión del riesgo del cambio (segunda parte)

    Microsoft Academic Search

    Juan Pablo Zorrilla Salgador

    1970-01-01

    Segunda parte del artículo acerca del uso de futuros sobre el tipo de cambio. Esta continuación abarca estrategias, definiciones, metodología y explicaciones sobre todo lo relacionado con el Ratio de cobertura de los futuros y la aparición del riesgo base.

  8. NaF Documentation

    Cancer.gov

    The NaF documentation files are presented in Adobe Acrobat or Word files. PDF Generic Documentation for NaF PDF file Word Generic Documentation for NaF Word file Contact G. Craig Hill, Ph.D. for information. Email: hillgc@mail.nih.gov, Phone: 240-276-5913 Print

  9. Na +\\/H + antiporters

    Microsoft Academic Search

    Etana Padan; Miro Venturi; Yoram Gerchman; Nir Dover

    2001-01-01

    Na+\\/H+ antiporters are membrane proteins that play a major role in pH and Na+ homeostasis of cells throughout the biological kingdom, from bacteria to humans and higher plants. The emerging genomic sequence projects already have started to reveal that the Na+\\/H+ antiporters cluster in several families. Structure and function studies of a purified antiporter protein have as yet been conducted

  10. CARACTERSTICAS Y ARTICULACIN DEL ESPACIO DEL MUNDO TERRENAL Y DEL ESPACIO DEL MS ALL

    E-print Network

    Paris-Sud XI, Université de

    1 12/03/2009 CARACTERÍSTICAS Y ARTICULACI�N DEL ESPACIO DEL MUNDO TERRENAL Y DEL ESPACIO DEL MÁS "El tiempo y el espacio en Gonzalo de Berceo"1. El estudio concierne toda la obra, y se centra en la las "herramientas mentales" que son la concepción del tiempo y del espacio. En lo que toca al segundo

  11. Uso de granos secos con sol Ubles ( ddgs ) provenientes de la destilería del maíz en s Uplementos para v acas lactantes en pastoreo de estrella africana ( Cynodon nlemfluensis)1

    Microsoft Academic Search

    Sofía Macaya-Quirós; Augusto Rojas-Bourrillón

    Use of corn dry distillers grains plus solubles ( ddgs ) in supplements for lactating cows grazing african s tar grass (Cynodon nlemfluensis). A study was carried out with dry corn distillers grains plus solubles (DDGS), to evaluate the effect of including different levels of this ingredient in the diet of lactating dairy cows grazing African Star grass, on milk

  12. NA57 main results

    E-print Network

    G. E. Bruno; for the NA57 Collaboration

    2007-10-15

    The CERN NA57 experiment was designed to study the production of strange and multi-strange particles in heavy ion collisions at SPS energies; its physics programme is essentially completed. A review of the main results is presented.

  13. Gestión del riesgo del cambio (primera parte)

    Microsoft Academic Search

    Juan Pablo Zorrilla Salgador

    1970-01-01

    A partir de la desaparición del sistema Bretton-Woods, y la libre flotación del\\u000atipo de cambio, el mundo se volvió más susceptible a todo tipo de riesgos.\\u000aEl presente artículo pretende explicar a los gestores financieros o empresarios interesados en el tema de instrumentos financieros derivados, a conocer lo\\u000amás relevante y necesario acerca del uso de futuros sobre el

  14. Estadísticas del cáncer

    Cancer.gov

    Información básica sobre las estadísticas del cáncer, las cuales describen las tendencias en grupos grandes de personas y ofrecen una imagen a través del tiempo de la carga que representa el cáncer en la sociedad.

  15. Študent naj bo na ameriškem kolidžu

    E-print Network

    Pirnat-Greenberg, Marta

    2007-01-01

    , že po obi?aju zelo naporen del leta, jaz pa sem letos s težavo prisopihala komaj do konca zime. Teh po?itnic sem se veselila, da se malo naspim in postorim vsaj nekaj stvari, s katerimi sem v zaostanku. Zelo se mi prileže, da imam na voljo ve? ?asa.... Ni? ne pomaga dokazovanje, da je poletna šola slovenskega jezika v Ljubljani zelo intenZivna, da vsebuje ve? kot zahtevano števi10 ur v štiritedenskem programu, da šesttedenski program v Sloveniji ne obstaja in da se na izpopolnjevalni stopnji...

  16. La regulación del precio del etanol en Colombia. ¿Teoría del interés general o teoría del interés privado?

    Microsoft Academic Search

    Luz Marina Romero Alvarado

    2010-01-01

    El objetivo de este artículo es presentar los resultados del trabajo de investigación en el que la unidad de análisis se delimitó a la regulación del precio del etanol en Colombia, desde la perspectiva de la regulación económica, siguiendo los enfoques de la teoría del interés general versus teoría del interés privado. El desarrollo del trabajo consistió en hallar la

  17. Museo Universitario del Chopo Datos del plan de estudio

    E-print Network

    Islas, León

    periodismo cultural para producir información en los diferentes géneros informativos, para su publicación características del fenómeno informativo, delimitando el campo de acción del periodista cultural. Utilizar los elementos del lenguaje periodístico. Distinguir la estructura de los diferentes géneros informativos

  18. Ácaros del mango

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Los ácaros constituyen un grupo abundante y diverso que ocupa diferentes hábitats en árboles frutales y la estructura y disposición del follaje y ramas del mango, contribuyen significativamente a que se presente gran diversidad de ácaros benéficos y dañinos asociados a esta especie frutal. En Colomb...

  19. en Fisioterapia del Deporte

    E-print Network

    Rey Juan Carlos, Universidad

    Experto en Fisioterapia del Deporte III Edición RESERVA DE PLAZAY MATRÍCULA Título: Experto en Fisioterapia del Deporte Precio de título: 1.800 Plazo de preinscripción: hasta 15 de Octubre 2014 Nº de que se encuentra matriculado en cuarto curso de grado en fisioterapia (en caso de alumnos

  20. Determinación del perfil instrumental del EBASIM

    NASA Astrophysics Data System (ADS)

    Nieva, M. F.; Rodriguez, M. V.; Pintado, O. I.

    Se calcula el perfil instrumental para el telescopio de 2,15m del CASLEO con EBASIM. Para ello se usaron flats de cielo y el espectro solar FTS de Kurucz. El método, que se puede utilizar para otras configuraciones instrumentales, es convolucionar ambos espectros para obtener los coeficientes de corrección.

  1. TEORÍAS DEL DESARROLLO A PRINCIPIOS DEL SIGLO XXI

    Microsoft Academic Search

    AMARTYA SEN

    1 La evolución de las ideas no sigue el curso de los siglos. Es más, en el transcurso del siglo XX hemos presenciado cambios radicales en lo que a teoría del desarrollo se refiere. Ni siquiera es indispensable definir los siglos de acuerdo con la clasificación del calendario, de cero a noventa y nueve. En su célebre discurso del 8

  2. Chirurgia Videoassistita del Diaframma

    Microsoft Academic Search

    Francesco Quarantotto; Giorgio Cavallesco; Gaetano Rocco

    La chirurgia videoassistita del diaframma rappresenta una naturale evoluzione della videotoracoscopia, volta a superare le\\u000a difficoltà tecniche di quest’ultima; questa metodica si pone come compromesso tra la videotoracoscopia e la toracotomia tradizionale:\\u000a in questo modo il chirurgo ha la possibilità di compiere manovre chirurgiche altrimenti di difficile esecuzione col solo accesso\\u000a toracoscopico, godendo di un’ottima visione del campo operatorio e

  3. -DERECHO PBLICO DEL ESTADO AUTONMICO La implantacin del Mster universitario en Derecho Pblico del Estado Autonmico

    E-print Network

    Rey Juan Carlos, Universidad

    - DERECHO PÚBLICO DEL ESTADO AUTONÓMICO La implantación del Máster universitario en Derecho Público del Estado Autonómico extinguirá el Máster Oficial en Derecho Autonómico y Local. Por esta razón se materias del Máster Oficial en Derecho Autonómico y Local. Los estudiantes que comenzaron el Máster Oficial

  4. Aceptabilidad del diagnóstico rápido casero para HIV entre hombres gay y otros hombres que tienen sexo con hombres (G&HSH) de la Ciudad de Buenos Aires

    PubMed Central

    Balán, Iván C.; Carballo-Diéguez, Alex; Marone, Rubén O.; Pando, María A.; Barreda, Victoria; Ávila, María M.

    2011-01-01

    Resumen El uso del diagnóstico rápido para HIV en Argentina, así como otros países de Latinoamérica, ha sido limitado hasta el momento. Este trabajo reporta los resultados provenientes de un estudio cualitativo realizado entre hombres gays y otros hombres que tienen sexo con hombres (G&HSH) de la Ciudad de Buenos Aires, Argentina. El objetivo principal del mismo fue conocer las ventajas y desventajas que los hombres G&HSH perciben en relación al diagnóstico rápido casero para HIV. Se realizaron ocho grupos focales con 73 participantes en los cuales se discutió acerca de las ventajas y desventajas del uso de los diagnósticos rápidos. Las respuestas fueron codificadas utilizando un programa para análisis de datos cualitativos (NVivo) y analizadas temáticamente. Los participantes describieron numerosas ventajas sobre el uso del diagnóstico rápido casero, aunque algunos reportaron importantes preocupaciones dentro de las cuales se destaca la posibilidad de impulsos suicidas si alguien recibe un resultado positivo estando solo. En términos generales se observó una gran aceptabilidad para el uso del diagnóstico rápido si el mismo es realizado por personal de salud en lugares acondicionados para este fin. PMID:25284951

  5. Challenges for Na-ion Negative Electrodes

    E-print Network

    Chevrier, V. L.

    Na-ion batteries have been proposed as candidates for replacing Li-ion batteries. In this paper we examine the viability of Na-ion negative electrode materials based on Na alloys or hard carbons in terms of volumetric ...

  6. Estudio del CH interestelar

    NASA Astrophysics Data System (ADS)

    Olano, C.; Lemarchand, G.; Sanz, A. J.; Bava, J. A.

    El objetivo principal de este proyecto consiste en el estudio de la distribución y abundancia del CH en nubes interestelares a través de la observación de las líneas hiperfinas del CH en 3,3 GHz. El CH es una molécula de amplia distribución en el espacio interestelar y una de las pocas especies que han sido observadas tanto con técnicas de radio como ópticas. Desde el punto de vista tecnológico se ha desarrollado un cabezal de receptor que permitirá la realización de observaciones polarimétricas en la frecuencia de 3,3 GHz, con una temperatura del sistema de 60 K y un ancho de banda de 140 MHz, y que será instalado en el foco primario de la antena parabólica del IAR. El cabezal del receptor es capaz de detectar señales polarizadas, separando las componentes de polarización circular derecha e izquierda. Para tal fin el cabezal consta de dos ramas receptoras que amplificarán la señal y la trasladarán a una frecuencia más baja (frecuencia intermedia), permitiendo de esa forma un mejor transporte de la señal a la sala de control para su posterior procesamiento. El receptor además de tener características polarimétricas, podrá ser usado en el continuo y en la línea, utilizando las ventajas observacionales y de procesamiento de señal que actualmente posee el IAR.

  7. Boletín del Centro Mexicano del Instituto Internacional de Teatro (ITT)

    E-print Network

    1986-04-01

    96 LATIN AMERICAN THEATRE REVIEW Boletín del Centro Mexicano del Instituto Internacional de Teatro (ITT) This tri-lingual (Spanish, English, French) bulletin about recent theatre activities in Mexico is published in collaboration with the Centro... for Children and Youth, University Theatre, the work of the Teatro del Instituto Mexicano del Seguro Social, and a list of productions for the 1984 season. It is hoped that the bulletin will help make Mexican theatre better known both nationally...

  8. Como Solicitar Los Beneficios del Seguro del Desempleo Transcripcin

    E-print Network

    Como Solicitar Los Beneficios del Seguro del Desempleo Transcripción Bienvenido a uno de los de desempleo en California, usted ha venido al lugar correcto, y aquí estamos para servirle. Este es a recibir sus beneficios del desempleo. Cuando usted hace una llamada u oprime su botón en su computadora

  9. Instantánea del cáncer de estómago

    Cancer.gov

    Información sobre las tendencias de incidencia, mortalidad y financiamiento del NCI sobre el cáncer de estómago; así como ejemplos de actividades del NCI y adelantos en la investigación de este tipo de cáncer.

  10. Instantánea del cáncer de ovario

    Cancer.gov

    Información sobre las tendencias de incidencia, mortalidad y financiamiento del NCI sobre el cáncer de ovario; así como ejemplos de actividades del NCI y adelantos en la investigación de este tipo de cáncer.

  11. Instantánea del cáncer de páncreas

    Cancer.gov

    Información sobre las tendencias de incidencia, mortalidad y financiamiento del NCI sobre el cáncer de páncreas; así como ejemplos de actividades del NCI y adelantos en la investigación de este tipo de cáncer.

  12. valorizzazione e fruizione del

    E-print Network

    Di Pillo, Gianni

    prevista per il Museo Orto Botanico di Roma, destinata all'educazione ambientale e alla "citizen science dati sulla biodiversità; un' app per Smartphone e Tablet dedicata alla fruizione del patrimonio storico della Biodiversità. Smartphone e tablet Il Progetto "SmartEcoPhone" ha realizzato una cross platform app

  13. Fisiología del crecimiento

    Microsoft Academic Search

    Arlan L. Rosenbloom

    2007-01-01

    ExtractoEl crecimiento humano es un proceso dinámico y complejo que comienza con la fertilización del óvulo y se completa con la fusión de las epífisis y las metáfisis de los huesos largos, que caracteriza la terminación de la adolescencia. El crecimiento ocurre en fases, con características distintivas en términos de influencias dominantes derivadas de factores y patrones genéticos, ambientales\\/nutricionales y

  14. Aithisg Bhliadhnail Coilltearachd na h-Alba

    E-print Network

    Aithisg Bhliadhnail Ùghdarras Coilltearachd na h-Alba Lèirmheas Bliadhnail 2007-2008 #12;Ùghdarras Coilltearachd na h-Alba Lèirmheas Bliadhnail 2007-08 1 | Ùghdarras Coilltearachd na h-Alba Lèirmheas Bliadhnail Leasachadh coimhearsnachd 11 Ruigsinneachd agus slàinte 14 Càileachd na h-àrainneachd 17 Bith-iomadachd 19 Mu

  15. NA-NET numerical analysis net

    Microsoft Academic Search

    Jack Dongarra; Bill Rosener

    1991-01-01

    This report describes a facility called NA-NET created to allow numerical analysts (na) an easy method of communicating with one another. The main advantage of the NA-NET is uniformity of addressing. All mail is addressed to the Internet host na-net.ornl.gov'' at Oak Ridge National Laboratory. Hence, members of the NA-NET do not need to remember complicated addresses or even where

  16. Nevado del Huila, Columbia

    NASA Technical Reports Server (NTRS)

    2007-01-01

    Nevado del Huila Volcano in Colombia is actually a volcanic chain running north to south, capped by a glacier. With peaks ranging in height from 2,600 to 5,780 meters (8,530 to 18,960 feet), Nevado del Huila is a stratovolcano composed of alternating layers of hardened lava, solidified ash, and volcanic rocks. Its first recorded eruption occurred in the mid-sixteenth century. The long-dormant volcano erupted again in mid-April 2007. A few months before the eruption, the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA's Terra satellite captured this image of Nevado del Huila, on February 23, 2007. In this image, the bright white area just east of the central summit is ice. Immediately west of the summit are bare rocks, appearing as blue-gray. West of those rocks, white reappears, but this patch of white results from clouds hovering in the nearby valley. In the east, the colors turn to brown (indicating bare rock) and bright green (indicating vegetation). ASTER photographed Nevado del Huila near the end of a long phase of quietude. On April 17, 2007, local authorities recorded seismic activity associated with rock fracturing on the volcano's central summit, according to the ReliefWeb Website. Activity intensified the following day with an eruption and mudflows, forcing thousands of nearby residents to evacuate. As the Associated Press reported, the eruption caused avalanches and floods that wiped away both houses and bridges. It marked the volcano's first recorded eruption since the Spanish colonized the area five centuries earlier. NASA image created by Jesse Allen, using data provided courtesy of the NASA/GSFC/MITI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team.

  17. 'Cortar na investigao como queimar

    E-print Network

    Instituto de Sistemas e Robotica

    estar à espera de receber algo em troca' A conferência promovida pela Fundação Francisco Manuel dos problema que afeta vá- rios países, na Europa. O que é algo que me preocupa. Antes de mais, é preciso cultura, por exemplo, é a sociedade estar à espera de receber algo em troca. A ci- ência melhora a nossa

  18. Sodium iron hexacyanoferrate with high Na content as a Na-rich cathode material for Na-ion batteries

    DOE PAGESBeta

    Guo, Ya; Yu, Xiqian; You, Ya; Yin, Yaxia; Nam, Kyung -Wan

    2015-01-01

    Owing to the worldwide abundance and low-cost of Na, room-temperature Na-ion batteries are emerging as attractive energy storage systems for large-scale grids. Increasing the Na content in cathode material is one of the effective ways to achieve high energy density. Prussian blue and its analogues (PBAs) are promising Na-rich cathode materials since they can theoretically store two Na ions per formula. However, increasing the Na content in PBAs cathode materials is a big challenge in the current. Here we show that sodium iron hexacyanoferrate with high Na content could be obtained by simply controlling the reducing agent and reaction atmospheremore »during synthesis. The Na content can reach as high as 1.63 per formula, which is the highest value for sodium iron hexacyanoferrate. This Na-rich sodium iron hexacyanoferrate demonstrates a high specific capacity of 150 mA h g-1 and remarkable cycling performance with 90% capacity retention after 200 cycles. Furthermore, the Na intercalation/de-intercalation mechanism is systematically studied by in situ Raman, X-ray diffraction and X-ray absorption spectroscopy analysis for the first time. The Na-rich sodium iron hexacyanoferrate could function as a plenteous Na reservoir and has great potential as a cathode material toward practical Na-ion batteries.« less

  19. Ionic regulation of Na absorption in proximal colon: cation inhibition of electroneutral Na absorption

    SciTech Connect

    Sellin, J.H.; De Soignie, R.

    1987-01-01

    Active Na absorption (J/sub net//sup NA/) in rabbit proximal colon in vitro is paradoxically stimulated as (Na) in the bathing media is lowered with constant osmolarity. J/sub m..-->..s//sup Na/ increases almost linearly from 0 to 50 mM (Na)/sub 0/ but then plateaus and actually decreases from 50 to 140 mM (Na)/sub 0/, consistent with inhibition of an active transport process. Both lithium and Na are equally effective inhibitors of J/sub net//sup Na/, whereas choline and mannitol do not block the high rate of J/sub net//sup Na/ observed in decreased (Na)/sub 0/. Either gluconate or proprionate replacement of Cl inhibits J/sub net//sup Na/. J/sub net//sup Na/ at lowered (Na)/sub 0/ is electrically silent and is accompanied by increased Cl absorption; it is inhibited by 10/sup -3/ M amiloride and 10/sup -3/ theophylline but not by 10/sup -4/ M bumetanide. Epinephrine is equally effective at stimulating Na absorption at 50 and 140 mM (Na). Na gradient experiments are consistent with a predominantly serosal effect of the decreased (Na)/sub 0/. These results suggest that 1) Na absorption in rabbit proximal colon in vitro is stimulated by decreased (Na); 2) the effect is cation specific, both Na and Li blocking the stimulatory effect; 3) the transport is mediated by Na-H exchange and is Cl dependent but 4) is under different regulatory mechanisms than the epinephrine-sensitive Na-Cl cotransport previously described in proximal colon. Under the appropriate conditions, proximal colon absorbs Na extremely efficiently. Na-H exchange in this epithelium is cation inhibitable, either directly or by a secondary regulatory process.

  20. Ionic regulation of Na absorption in proximal colon: cation inhibition of electroneutral Na absorption

    Microsoft Academic Search

    J. H. Sellin; R. De Soignie

    1987-01-01

    Active Na absorption (J\\/sub net\\/\\/sup NA\\/) in rabbit proximal colon in vitro is paradoxically stimulated as (Na) in the bathing media is lowered with constant osmolarity. J\\/sub m..-->..s\\/\\/sup Na\\/ increases almost linearly from 0 to 50 mM (Na)â but then plateaus and actually decreases from 50 to 140 mM (Na)â, consistent with inhibition of an active transport process. Both lithium

  1. Europlanet NA2 Science Networking

    NASA Astrophysics Data System (ADS)

    Harri, Ari-Matti; Szego, Karoly; Genzer, Maria; Schmidt, Walter; Krupp, Norbert; Lammer, Helmut; Kallio, Esa; Haukka, Harri

    2013-04-01

    Europlanet RI / NA2 Science Networking [1] focused on determining the major goals of current and future European planetary science, relating them to the Research Infrastructure that the Europlanet RI project [2] developed, and placing them in a more global context. NA2 also enhanced the ability of European planetary scientists to participate on the global scene with their own agenda-setting projects and ideas. The Networking Activity NA2 included five working groups, aimed at identifying key science issues and producing reference books on major science themes that will bridge the gap between the results of present and past missions and the scientific preparation of the future ones. Within the Europlanet RI project (2009-2012) the NA2 and NA2-WGs organized thematic workshops, an expert exchange program and training groups to improve the scientific impact of this Infrastructure. The principal tasks addressed by NA2 were: • Science activities in support to the optimal use of data from past and present space missions, involving the broad planetary science community beyond the "space club" • Science activities in support to the preparation of future planetary missions: Earth-based preparatory observations, laboratory studies, R&D on advanced instrumentation and exploration technologies for the future, theory and modeling etc. • Develop scientific activities, joint publications, dedicated meetings, tools and services, education activities, engaging the public and industries • Update science themes and addressing the two main scientific objectives • Prepare and support workshops of the International Space Science Institute (ISSI) in Bern and • Support Trans National Activities (TNAs), Joined Research Activities (JRAs) and the Integrated and Distributed Information Service (IDIS) of the Europlanet project These tasks were achieved by WG workshops organized by the NA2 working groups, by ISSI workshops and by an Expert Exchange Program. There were 17 official WG workshops and in addition there were numerous smaller NA2 WG meetings during the conferences (EPSC, EGU, etc.) and other events. The total number of NA2 meetings and workshops was 37. There were three NA2 supported ISSI workshops within the Europlanet project. The first ISSI workshop "Comparison of the plasma-spheres of Mars, Venus, and Titan" organized by K. Szego was held in December 2009. The second workshop "Quantifying the Martian Geochemical Reservoirs" by M. Toplis was held in April 2011. The third one, themed "Giant Planet Magnetodiscs and Aurorae" by N. Krupp, N. Achilleos and C. Arridge, was in November 2012. All three ISSI workshops were selected by the ISSI scientific committee to be organized within the frame of ISSI/Europlanet agreement and held in Bern. The main objective of the Expert Exchange Program was to support the activities of Europlanet RI with experts whenever needed. The programme provided funding for short visits (up to one week) of expert with the goal of improving infrastructure facilities and services offered to the scientific community by the Europlanet RI participant (contractor) laboratories or institutes. Between July 2009 and September 2012 26 applications were selected. Acknowledgement: Europlanet RI was funded by the European Commission under the 7th Framework Program, grant 228319 "Capacities Specific Programme" - Research Infrastructures Action. References: [1] http://www.europlanet-ri.eu/ [2] https://europlanet-scinet.fi/

  2. NA61/SHINE ion program

    E-print Network

    Maja Mackowiak for the NA61 Collaboration

    2010-09-06

    The Super Proton Synchrotron (SPS) at CERN covers one of the most interesting regions of the phase diagram (T - \\mu_{B}) of strongly interacting matter. The study of central Pb+Pb collisions by NA49 indicate that the threshold for deconfinement is reached already at the low SPS energies. Theoretical considerations predict a critical point of strongly interacting matter at energies accessible at the SPS. The NA61/SHINE experiment, a successor of the NA49 project, will study hadron production in p+p, p+A, h+A, and A+A reactions at various energies. The broad physics program includes the investigation of the properties of strongly interacting matter, as well as precision measurements of hadron spectra for the T2K neutrino experiment and for the Pierre Auger Observatory and KASCADE cosmic-ray projects. The main physics goals of the NA61/SHINE ion program are to study the properties of the onset of deconfinement at low SPS energies and to find signatures of the critical point of strongly interacting matter. To achieve these goals a broad range in the (T - \\mu_{B}) phase diagram will be covered by performing an energy (10A-158A GeV/c) and system size (p+p, B+C, Ar+Ca, Xe+La) scan. The first data for this 2-D scan were taken in 2009, i.e. p+p interactions at 20, 30, 40, 80, 158 GeV/c beam energy. This contribution will summarize physics arguments for the NA61/SHINE ion program, show the detector performance and present the current status of the experiment and plans for the next years.

  3. Na+ Tolerance and Na+ Transport in Higher Plants

    PubMed Central

    TESTER, MARK; DAVENPORT, ROMOLA

    2003-01-01

    Tolerance to high soil [Na+] involves processes in many different parts of the plant, and is manifested in a wide range of specializations at disparate levels of organization, such as gross morphology, membrane transport, biochemistry and gene transcription. Multiple adaptations to high [Na+] operate concurrently within a particular plant, and mechanisms of tolerance show large taxonomic variation. These mechanisms can occur in all cells within the plant, or can occur in specific cell types, reflecting adaptations at two major levels of organization: those that confer tolerance to individual cells, and those that contribute to tolerance not of cells per se, but of the whole plant. Salt?tolerant cells can contribute to salt tolerance of plants; but we suggest that equally important in a wide range of conditions are processes involving the management of Na+ movements within the plant. These require specific cell types in specific locations within the plant catalysing transport in a coordinated manner. For further understanding of whole plant tolerance, we require more knowledge of cell?specific transport processes and the consequences of manipulation of transporters and signalling elements in specific cell types. PMID:12646496

  4. PROGRAMA PROFESORES PRECIO DEL CURSO

    E-print Network

    PROGRAMA PROFESORES PRECIO DEL CURSO 300,00 (exento I.V.A) (5 becas para estudiantes de doctorado apertura del curso. 10'00 h Cementos alcalinos: Introducción 11'00 h Café. 11,30 h Activación alcalina de (2011 ­ 2012) CURSO DE POSTGRADO DEL CSIC 20 A 21 de Marzo de 2012 Organizado por: INSTITUTO DE CIENCIAS

  5. Festival del Sur '98

    E-print Network

    Má rquez Montes, Carmen

    1999-04-01

    clásico de Rojas se encarna en el actor y hace un recorrido por su historia, rememorando su nacimiento y las diversas etapas de éxito u olvido en su devenir; asimismo menciona los actores que le han interpretado y su opinión sobre ellos. Sobresale en... Angélica en el umbral del cielo de Eduardo Amor; La República con Chatarra, obra de creación colectiva; Clapso con Marea, espectáculo de danza; y Limundi con Fagolera, espectáculo de calle, con el fuego como nexo de unión. Las Palmas de Gran Canaria...

  6. AAnnuuaarriioo Universidad Nacional del Sur

    E-print Network

    Maguitman, Ana Gabriela

    Doctor Hugo Laborde Secretario del Consejo Superior Universitario Abogado Diego Duprat Secretario General Académico Doctor Marcelo Villar Secretario General de Ciencia y Tecnología Doctor Alfredo Juan Secretario

  7. Paul Cockshott, Allin Cottrell Las ideas importantes del socialismo del

    E-print Network

    Cockshott, W. Paul

    : Acabó con la polarización de la sociedad en ricos y pobres Acabó con el desempleo Logró progreso ventajas: Alguna reducción en las desigualdades del ingreso Reducción del desempleo Progreso económico para diferencias grandes entre unos billonarios y los trabajadores ordinarios seguían. El desempleo masivo

  8. Las teorías del desarrollo a principios del siglo XXI

    Microsoft Academic Search

    Amartya Sen

    1998-01-01

    Este artículo revisa el estado actual de las teorías del desarrollo teniendo en cuenta la experiencia histórica y la evolución interna de la teoría desde finales de la Segunda Guerra Mundial. Aunque la comprensión del desarrollo ha mejorado, se han hecho generalizaciones indebidas y extraído lecciones infundadas. Sen rechaza la oposición entre Estado y mercado y entre planificación y rentabilidad,

  9. Manejo Ambiental del Asma Peditrica

    E-print Network

    Bezrukov, Sergey M.

    Manejo Ambiental del Asma Pediátrica Guías para el Personal de Salud #12;Aprobado por Ambulatory Nurse Practitioners #12;Manejo Ambiental del Asma Pediátrica Guías para el Personal de Salud Agosto National Institute of Environmental Health Sciences. #12;Iniciativa para el Asma Pediátrica Comité

  10. EL ORIGEN BIOLÓGICO DEL DERECHO

    Microsoft Academic Search

    Axel P. Retana-Salazar

    En este trabajo se aborda el posible origen evolutivo del derecho como una consecuencia del desarrollo social de nuestra especie. Otras especies con sistemas sociales similares presentan varias reglas para la convivencia en grupo. Algunas de estas reglas son comunes en todas las especies con comportamiento social. El desarrollo de la sociobiología en las últimas décadas es una herramienta importante

  11. ENSAYO SOBRE LA OSCILACI ´ ON DEL MEDITERR ´ ANEO OCCIDENTAL Y SU INFLUENCIA EN LA PLUVIOMETRIA DEL ESTE DE ESPA ˜ NA

    Microsoft Academic Search

    Javier MARTIN VIDE

    An index of the Western Mediterranean Oscillation (WeMO) as the difference of the standarized pressures between Cadiz-San Fernando and Padua is defined. This low frequency variability pat- tern shows negative correlation with the winter precipitation (January) at Murcia, Alicante and Valencia, better than with the NAO.

  12. Metodologa de investigacin para la restauracin del

    E-print Network

    Rey Benayas, José María

    DESARROLLO SOSTENIBLE DEL MEDIO RURAL LEY DE 28 DE MAYO DE 2007, DE SUELO #12;CAMBIOS EN LOS USOS DEL SUELO sostenible es reivindicar el paisaje como la materialización del encuentro entre el territorio, la acción

  13. Monitor de Pilates Programa del curso

    E-print Network

    Escolano, Francisco

    1 Monitor de Pilates Programa del curso 1. Bases biomédicas del Pilates (15 HORAS). 1 técnicos y comunicativos: aspectos psicosociales y emocionales. Estructura del curso 50 horas. Número: Fútbol · Profesor Master, Posgrados y Cursos Universidad Europea Madrid, Universidad CAECE, Universidad

  14. NaCl Potentiates Human Fibrocyte Differentiation

    PubMed Central

    Cox, Nehemiah; Pilling, Darrell; Gomer, Richard H.

    2012-01-01

    Excessive NaCl intake is associated with a variety of fibrosing diseases such as renal and cardiac fibrosis. This association has been attributed to increased blood pressure as the result of high NaCl intake. However, studies in patients with high NaCl intake and fibrosis reveal a connection between NaCl intake and fibrosis that is independent of blood pressure. We find that increasing the extracellular concentration of NaCl to levels that may occur in human blood after high-salt intake can potentiate, in serum-free culture conditions, the differentiation of freshly-isolated human monocytes into fibroblast-like cells called fibrocytes. NaCl affects the monocytes directly during their adhesion. Potassium chloride and sodium nitrate also potentiate fibrocyte differentiation. The plasma protein Serum Amyloid P (SAP) inhibits fibrocyte differentiation. High levels of extracellular NaCl change the SAP Hill coefficient from 1.7 to 0.8, and cause a four-fold increase in the concentration of SAP needed to inhibit fibrocyte differentiation by 95%. Together, our data suggest that NaCl potentiates fibrocyte differentiation. NaCl-increased fibrocyte differentiation may thus contribute to NaCl-increased renal and cardiac fibrosis. PMID:23029177

  15. The MoNA Project

    NASA Astrophysics Data System (ADS)

    Vanwylen, P. J.; Bychowski, J. P.; Deyoung, P. A.; Peaslee, G. F.

    2002-10-01

    Many nuclear experiments involve the detection of neutrons after a reaction. This is especially true for radioactive nuclear beam experiments where the number of neutrons is often higher than in normal nuclear matter. Unlike charged particles, neutrons experience no Coulomb interaction, which makes their detection difficult. At the NSCL, this task has become even harder with the higher energies available from the coupled cyclotrons. The MoNA, or Modular Neutron Array, project is building a new neutron detector, which will achieve nearly 70% detection efficiency for neutron energies up to 250 MeV. The detector is comprised of 144 slats of scintillating plastic (200 x 10 x 10 cm) with photomultiplier tubes on each end to give position information of events. Hope College is one of nine undergraduate institutions involved in the MoNA collaboration. The construction process for Hope's sixteen neutron slats will be presented along with the results of testing showing that the slats give excellent position information. Light attenuation measurements generally exhibit the expected trends, but do not fit a standard exponential decay model precisely. A ray-tracing simulation of the slat geometry was created to investigate this behavior. Preliminary data from this program, reproducing some of the same unexpected results, will be shown.

  16. Evaluation of Fc?RIIIB-NA1/NA2 Polymorphism in Visceral Leishmaniasis

    PubMed Central

    Abasi, Mohammad; Lotfi, Pegah; Bazmani, Ahad; Matini, Mohamad; Hajilooi, Mehrdad

    2014-01-01

    Background: Several lines of evidence demonstrating that innate and adaptive immunity play important roles in the defense against visceral leishmaniasis (VL). A polymorphism within the Fc?RIIIB gene can lead to the expression of three variants of NA1, NA2, and the combined one (NA1/NA2) which alters affinity of IgG to its receptor. Objectives: The main aim of this study was to evaluate the Fc?RIIIB-NA1/NA2 polymorphism in the Fc?RIIIB gene of VL patients in comparison to healthy controls. Patients and Methods: In this cross-sectional study, three groups; 54 seropositive patients with clinical presentation of VL (group 1), 104 seropositive patients without clinical presentation (group 2), and 104 healthy controls (group 3) were evaluated with respect to the Fc?RIIIB-NA1/NA2 polymorphism using a PCR-SSP method. The titration of anti-leishmania antibodies was analyzed using an immunoflorescence technique. Results: Our results indicated that polymorphisms within the Fc?RIIIB gene (that lead to the expression of the NA1/NA2 isoforms) are significantly associated with VL. The results demonstrated that the genotype heterozygotic for Fc?RIIIB-NA1/NA2 expression was significantly increased in VL patients, group 1 when compared to groups 2 and 3. Conversely, there is a decrease in homozygous NA1 and NA2 genotypes in VL patients; however, the overall frequency of NA1 and NA2 alleles appear similar across the three cohorts examined. Conclusions: According to our results, it is likely that the increased frequency of the Fc?RIIIB-NA1/NA2 genotype is associated with impaired immune responses against VL and its subsequent clearance from the patient. PMID:24910789

  17. Los Logros y las Carencias de las Transferencias de Efectivo Condicionadass: Evaluación del Impacto del Programa Tekoporã del Paraguay

    Microsoft Academic Search

    Fabio Veras Soares; Rafael Perez Ribas; Guilherme Issamu Hirata

    2008-01-01

    El Centro Internacional de Pobreza (CIP), con el apoyo del GTZ y el FNUAP, ha llevado a cabo recientemente una evaluación del impacto del programa piloto de Tekoporã, un programa de transferencias de efectivo condicionadas (CCT, en su sigla inglesa) en Paraguay. Previamente, el CIP analizó el marco lógico del programa y sus dificultades de aplicación, y se evaluaron sus

  18. Alberto del Pozo

    NSDL National Science Digital Library

    The Cuban Heritage Collection of the University of Miami Libraries was a recipient of 17 original illustrations by Alberto del Pozo in 1998 from the Campilli family. "The Oricha Collection" is their gift, and it contains illustrations in pen, crayon, and ink and the collection "pays homage to the primary gods and goddesses that comprise the Afro-Cuban religion of Santer'a." The "Introduction" near the top of the page, is a good place for visitors to start learning about Pozo, who was a Parson's School of Design-trained, Cuban artist who died at the age of 47. The "Biographical Sketch" is worth looking at as well. Examples of his colorful, heavily patterned and symbolism-intensive drawings of Santeria gods and goddesses can be found in the link "Gallery". The description of each drawing is given in English and Spanish. Finally, visitors interested in more information on the Santeria, can look at the "Further Readings" link for authoritative books on the subject.

  19. Simulation study of Na-majorite

    NASA Astrophysics Data System (ADS)

    Dymshits, A.; Vinograd, V.; Paulsen, N.; Winkler, B.; Perchuk, L.; Bobrov, A.

    2009-04-01

    Garnets, which are found as inclusions in diamonds, often have the excess of Na2O and SiO2 [Stachel, 2001]. Experimental studies suggest that Na is incorporated in pyrope-rich garnet via the coupled substitution Mg+Al=Na+Si [Bobrov et al., 2008]. This study is concerned with the determination of the structure and the thermodynamic properties of NaGrt (Na2MgSi5O12), which is assumed to be the end-member of pyrope-rich garnets with the excess of Na2O and SiO2. Static lattice energy calculations were performed with the program GULP [Gale & Rohl, 2003] using the force-field model [Vinograd et al., 2007] for 200 structures of Na2MgSi5O12 composition. These structures were prepared from Ia3-d pyrope Mg3Al2Si3O12 by replacing all octahedral Al atoms with Si and 2/3 of Mg atoms with Na. The distribution of Mg and Na was varied randomly. The static energies of these structures were cluster expanded using 8 pairwise effective cluster interactions (ECI). The ECIs were used to constrain Monte Carlo simulations within a 4×4×4 supercell (NNN exchangeable sites). The annealing experiments have shown that the lowest energy structure has the space group I4

  20. NA-NET numerical analysis net

    SciTech Connect

    Dongarra, J. (Tennessee Univ., Knoxville, TN (United States). Dept. of Computer Science Oak Ridge National Lab., TN (United States)); Rosener, B. (Tennessee Univ., Knoxville, TN (United States). Dept. of Computer Science)

    1991-12-01

    This report describes a facility called NA-NET created to allow numerical analysts (na) an easy method of communicating with one another. The main advantage of the NA-NET is uniformity of addressing. All mail is addressed to the Internet host na-net.ornl.gov'' at Oak Ridge National Laboratory. Hence, members of the NA-NET do not need to remember complicated addresses or even where a member is currently located. As long as moving members change their e-mail address in the NA-NET everything works smoothly. The NA-NET system is currently located at Oak Ridge National Laboratory. It is running on the same machine that serves netlib. Netlib is a separate facility that distributes mathematical software via electronic mail. For more information on netlib consult, or send the one-line message send index'' to netlib{at}ornl.gov. The following report describes the current NA-NET system from both a user's perspective and from an implementation perspective. Currently, there are over 2100 members in the NA-NET. An average of 110 mail messages pass through this facility daily.

  1. NA-NET numerical analysis net

    SciTech Connect

    Dongarra, J. [Tennessee Univ., Knoxville, TN (United States). Dept. of Computer Science]|[Oak Ridge National Lab., TN (United States); Rosener, B. [Tennessee Univ., Knoxville, TN (United States). Dept. of Computer Science

    1991-12-01

    This report describes a facility called NA-NET created to allow numerical analysts (na) an easy method of communicating with one another. The main advantage of the NA-NET is uniformity of addressing. All mail is addressed to the Internet host ``na-net.ornl.gov`` at Oak Ridge National Laboratory. Hence, members of the NA-NET do not need to remember complicated addresses or even where a member is currently located. As long as moving members change their e-mail address in the NA-NET everything works smoothly. The NA-NET system is currently located at Oak Ridge National Laboratory. It is running on the same machine that serves netlib. Netlib is a separate facility that distributes mathematical software via electronic mail. For more information on netlib consult, or send the one-line message ``send index`` to netlib{at}ornl.gov. The following report describes the current NA-NET system from both a user`s perspective and from an implementation perspective. Currently, there are over 2100 members in the NA-NET. An average of 110 mail messages pass through this facility daily.

  2. Painful Na-channelopathies: an expanding universe.

    PubMed

    Waxman, Stephen G

    2013-07-01

    The universe of painful Na-channelopathies--human disorders caused by mutations in voltage-gated sodium channels--has recently expanded in three dimensions. We now know that mutations of sodium channels cause not only rare genetic 'model disorders' such as inherited erythromelalgia and channelopathy-associated insensitivity to pain but also common painful neuropathies. We have learned that mutations of NaV1.8, as well as mutations of NaV1.7, can cause painful Na-channelopathies. Moreover, recent studies combining atomic level structural models and pharmacogenomics suggest that the goal of genomically guided pain therapy may not be unrealistic. PMID:23664154

  3. I Encuentro del Equipo Ejecutivo Vicerrectorado Administrativo

    E-print Network

    Vásquez, Carlos

    Gestión del Capital Humano · Incremento de la eficacia, eficiencia y rendimiento de la DGCH · Mejoramiento de Gestión del Capital Humano · Digitalización de los EXPEDIENTES · Sistema de Información Gestión del Capital Humano METAS 2009-2013 ·Diagnóstico y Reorganización de la DGCH ·Implantación del

  4. NOTES DEL SEMINARI FUNCIONS THETA

    E-print Network

    Travesa, Artur

    NOTES DEL SEMINARI FUNCIONS THETA Barcelona, 2003 #12;10 Notes del Seminari de Teoria de Nombres (UB-UAB-UPC) Comitè editorial P. Bayer E. Nart J. Quer #12;FUNCIONS THETA Edició a cura de P. Bayer J-02 ISBN: 84-923250-7-0 #12;iv #12;´Index 1 Funcions theta de Jacobi i corbes el·l´iptiques (I) E. Torres 3

  5. INFORME SOBRE L'APLICACI DEL RGIM DE DEDICACI DEL PROFESSORAT DE LA UPC

    E-print Network

    Casanellas, Marta

    ;1 INFORME AVALUACIÓ DEL RÈGIM DE DEDICACIÓ DEL PDI DE LA UPC Convocatòria 2011 PREÀMBUL En data 24 de juliol realitzar la difusió dels resultats del procés entre el PDI afectat, es varen gestionar les incidències'aquesta fase, són Difusió dels resultats · Total PDI avaluat 1.755 · PDI que va accedir a l'aplicació 1.557 (88

  6. Na+/Ca2+ exchange and Na+/K+-ATPase in the heart.

    PubMed

    Shattock, Michael J; Ottolia, Michela; Bers, Donald M; Blaustein, Mordecai P; Boguslavskyi, Andrii; Bossuyt, Julie; Bridge, John H B; Chen-Izu, Ye; Clancy, Colleen E; Edwards, Andrew; Goldhaber, Joshua; Kaplan, Jack; Lingrel, Jerry B; Pavlovic, Davor; Philipson, Kenneth; Sipido, Karin R; Xie, Zi-Jian

    2015-03-15

    This paper is the third in a series of reviews published in this issue resulting from the University of California Davis Cardiovascular Symposium 2014: Systems approach to understanding cardiac excitation-contraction coupling and arrhythmias: Na(+) channel and Na(+) transport. The goal of the symposium was to bring together experts in the field to discuss points of consensus and controversy on the topic of sodium in the heart. The present review focuses on cardiac Na(+)/Ca(2+) exchange (NCX) and Na(+)/K(+)-ATPase (NKA). While the relevance of Ca(2+) homeostasis in cardiac function has been extensively investigated, the role of Na(+) regulation in shaping heart function is often overlooked. Small changes in the cytoplasmic Na(+) content have multiple effects on the heart by influencing intracellular Ca(2+) and pH levels thereby modulating heart contractility. Therefore it is essential for heart cells to maintain Na(+) homeostasis. Among the proteins that accomplish this task are the Na(+)/Ca(2+) exchanger (NCX) and the Na(+)/K(+) pump (NKA). By transporting three Na(+) ions into the cytoplasm in exchange for one Ca(2+) moved out, NCX is one of the main Na(+) influx mechanisms in cardiomyocytes. Acting in the opposite direction, NKA moves Na(+) ions from the cytoplasm to the extracellular space against their gradient by utilizing the energy released from ATP hydrolysis. A fine balance between these two processes controls the net amount of intracellular Na(+) and aberrations in either of these two systems can have a large impact on cardiac contractility. Due to the relevant role of these two proteins in Na(+) homeostasis, the emphasis of this review is on recent developments regarding the cardiac Na(+)/Ca(2+) exchanger (NCX1) and Na(+)/K(+) pump and the controversies that still persist in the field. PMID:25772291

  7. NaHCO3 - A source of Na atoms for sudden sodium layers?

    Microsoft Academic Search

    Ulf von Zahn; Edmond Murad

    1990-01-01

    Consideration is given to the case of sudden sodium layers, reported in the lower E region of the ionosphere. It is suggested that dissociative electron attachment to NaHCO3, NaHCO3 + e yields Na + HCO3(-), can explain some of the observations, in particular at altitudes above 95 km. This process would produce Na efficiently only in the case where a

  8. Lazamrsa 18: 45-93 (1997> Los macrolquenes del macizo del Calar del Mundo

    E-print Network

    Herrera, Carlos M.

    resvulu dci viul esucíclicí, ciii csitciitueci ílcir(sxictu de ivís niacrvuiíqoenes del nísucizo ciel 0 Sierra de A iccírcí, A ihacereí Vn el - se d u y uunua dci baliacrgtu de cnn tuulcul dc 126 especies y

  9. Intracellular [Na +], Na + pathways, and fluid transport in cultured bovine corneal endothelial cells

    Microsoft Academic Search

    Kunyan Kuang; Yansui Li; Maimaiti Yiming; José M. Sánchez; Pavel Iserovich; E. J. Cragoe; Friedrich P. J. Diecke; Jorge Fischbarg

    2004-01-01

    The mechanism of fluid transport across corneal endothelium remains unclear. We examine here the relative contributions of cellular mechanisms of Na+ transport and the homeostasis of intracellular [Na+] in cultured bovine corneal endothelial cells, and the influence of ambient Na+ and HCO3?on the deturgescence of rabbit cornea. Bovine corneal endothelial cells plated on glass coverslips were incubated for 60 min

  10. Na3DyCl6

    PubMed Central

    Schurz, Christian M.; Meyer, Gerd; Schleid, Thomas

    2011-01-01

    Single crystals of the title compound, tris­odium hexa­chloridodysprosate, Na3DyCl6, were obtained as a by-product of synthesis using dysprosium(III) chloride and sodium chloride among others. The monoclinic structure with its typical ? angle close to 90° [90.823 (4)°] is isotypic with the mineral cryolite (Na3AlF6) and the high-temperature structure of the Na3 MCl6 series, with M = Eu–Lu, Y and Sc. The isolated, almost perfect [DyCl6]3? octa­hedra are inter­connected via two crystallographically different Na+ cations: while one Na+ resides on centres of symmetry (as well as Dy3+) and also builds almost perfect, isolated [NaCl6]5? octa­hedra, the other Na+ is surrounded by seven chloride anions forming a distorted [NaCl7]6? trigonal prism with just one cap as close secondary contact. PMID:21754259

  11. 7, 54135437, 2007 Global Na layer

    E-print Network

    Paris-Sud XI, Université de

    Discussions Satellite measurements of the global mesospheric sodium layer Z. Y. Fan1 , J. M. C. Plane2 , J Discussion EGU Abstract Optimal estimation theory is used to retrieve the absolute Na density profiles, have been analysed to yield the sea-5 sonal and latitudinal variation of the Na layer column abundance

  12. Regulation of Na+ fluxes in plants

    PubMed Central

    Maathuis, Frans J. M.; Ahmad, Izhar; Patishtan, Juan

    2014-01-01

    When exposed to salt, every plant takes up Na+ from the environment. Once in the symplast, Na+ is distributed within cells and between different tissues and organs. There it can help to lower the cellular water potential but also exert potentially toxic effects. Control of Na+ fluxes is therefore crucial and indeed, research shows that the divergence between salt tolerant and salt sensitive plants is not due to a variation in transporter types but rather originates in the control of uptake and internal Na+ fluxes. A number of regulatory mechanisms has been identified based on signaling of Ca2+, cyclic nucleotides, reactive oxygen species, hormones, or on transcriptional and post translational changes of gene and protein expression. This review will give an overview of intra- and intercellular movement of Na+ in plants and will summarize our current ideas of how these fluxes are controlled and regulated in the early stages of salt stress. PMID:25278946

  13. Extracellular Na+ levels regulate formation and activity of the NaX/alpha1-Na+/K+-ATPase complex in neuronal cells

    PubMed Central

    Berret, Emmanuelle; Smith, Pascal Y.; Henry, Mélaine; Soulet, Denis; Hébert, Sébastien S.; Toth, Katalin; Mouginot, Didier; Drolet, Guy

    2014-01-01

    MnPO neurons play a critical role in hydromineral homeostasis regulation by acting as sensors of extracellular sodium concentration ([Na+]out). The mechanism underlying Na+-sensing involves Na+-flow through the NaX channel, directly regulated by the Na+/K+-ATPase ?1-isoform which controls Na+-influx by modulating channel permeability. Together, these two partners form a complex involved in the regulation of intracellular sodium ([Na+]in). Here we aim to determine whether environmental changes in Na+ could actively modulate the NaX/Na+/K+-ATPase complex activity. We investigated the complex activity using patch-clamp recordings from rat MnPO neurons and Neuro2a cells. When the rats were fed with a high-salt-diet, or the [Na+] in the culture medium was increased, the activity of the complex was up-regulated. In contrast, drop in environmental [Na+] decreased the activity of the complex. Interestingly under hypernatremic condition, the colocalization rate and protein level of both partners were up-regulated. Under hyponatremic condition, only NaX protein expression was increased and the level of NaX/Na+/K+-ATPase remained unaltered. This unbalance between NaX and Na+/K+-ATPase pump proportion would induce a bigger portion of Na+/K+-ATPase-control-free NaX channel. Thus, we suggest that hypernatremic environment increases NaX/Na+/K+-ATPase ?1-isoform activity by increasing the number of both partners and their colocalization rate, whereas hyponatremic environment down-regulates complex activity via a decrease in the relative number of NaX channels controlled by the pump. PMID:25538563

  14. Temas y rumbos del teatro rural hispanoamericano del siglo XX.

    E-print Network

    Neglia, Erminio G.

    1971-10-01

    clima y a la posición económica de los campesinos, está en el centro de la acción y, en ocasiones, se humaniza, convirtiéndose en uno de los protagonistas de la obra, v. gr., Por los caminos van los campesinos del nicaragüense Pablo Antonio Cuadra... mayor importancia para el campesino, cuya susceptibilidad en ciertas materias, v. gr., el honor de la mujer, es extremada y distinta de la del hombre que vive en la ciudad. En Por los caminos van los campesinos de Pablo Antonio Cuadra, Sebastián mata...

  15. NMR studies on Na+ transport in Synechococcus PCC 6311

    NASA Technical Reports Server (NTRS)

    Nitschmann, W. H.; Packer, L.

    1992-01-01

    The freshwater cyanobacterium Synechococcus PCC 6311 is able to adapt to grow after sudden exposure to salt (NaCl) stress. We have investigated the mechanism of Na+ transport in these cells during adaptation to high salinity. Na+ influx under dark aerobic conditions occurred independently of delta pH or delta psi across the cytoplasmic membrane, ATPase activity, and respiratory electron transport. These findings are consistent with the existence of Na+/monovalent anion cotransport or simultaneous Na+/H+ +anion/OH- exchange. Na+ influx was dependent on Cl-, Br-, NO3-, or NO2-. No Na+ uptake occurred after addition of NaI, NaHCO3, or Na2SO4. Na+ extrusion was absolutely dependent on delta pH and on an ATPase activity and/or on respiratory electron transport. This indicates that Na+ extrusion via Na+/H+ exchange is driven by primary H+ pumps in the cytoplasmic membrane. Cells grown for 4 days in 0.5 m NaCl medium, "salt-grown cells," differ from control cells by a lower maximum velocity of Na+ influx and by lower steady-state ratios of [Na+]in/[Na+]out. These results indicate that cells grown in high-salt medium increase their capacity to extrude Na+. During salt adaptation Na+ extrusion driven by respiratory electron transport increased from about 15 to 50%.

  16. EL ROL DEL GNERO DENTRO DEL PROCESO DE APRENDIZAJE COLABORATIVO

    E-print Network

    Guerrero, Luis

    de sexo y la forma en que esto afecta las actividades colaborativas. En el presente trabajo se describen los resultados de un experimento desarrollado con el fin de establecer que la diferencia de sexo]. Varios estudios también han demostrado que las diferencias de sexo en el uso del computador están

  17. ¿Macroeconomía mexicana sana? A tres años del “gobierno del empleo”

    Microsoft Academic Search

    Martín Carlos Ramales Osorio

    2009-01-01

    por efectos de la crisis financiera y económica internacional, así como por la aplicación de políticas monetarias y fiscales sumamente restrictivas, a casi tres años de la gestión calderonista los saldos en materia de crecimiento económico y empleo son absolutamente negativos. De cumplirse las previsiones de crecimiento del FMI para este año, que lo ubica en -7.3 por ciento, durante

  18. Magnetic shielding of 23 Na nuclei in NaNO 3 and NaBrO 3 single crystals

    Microsoft Academic Search

    S. F. Sagnowski; Z. Sulek; M. Stachura; J. Ogar

    1982-01-01

    Single crystals of sodium nitrate, sodium chlorate and sodium bromate were investigated by continuous wave and Fourier transform pulse techniques. The sodium shielding tensors for studied compounds were found from the shift of the central line of23Na triplet, which was measured as a function of the crystal orientation. The shielding appears isotropic in NaNO3 and anisotropic in chlorate and bromate

  19. Catalysis of Na+ permeation in the bacterial sodium channel NaVAb

    PubMed Central

    Chakrabarti, Nilmadhab; Ing, Christopher; Payandeh, Jian; Zheng, Ning; Catterall, William A.; Pomès, Régis

    2013-01-01

    Determination of a high-resolution 3D structure of voltage-gated sodium channel NaVAb opens the way to elucidating the mechanism of ion conductance and selectivity. To examine permeation of Na+ through the selectivity filter of the channel, we performed large-scale molecular dynamics simulations of NaVAb in an explicit, hydrated lipid bilayer at 0 mV in 150 mM NaCl, for a total simulation time of 21.6 ?s. Although the cytoplasmic end of the pore is closed, reversible influx and efflux of Na+ through the selectivity filter occurred spontaneously during simulations, leading to equilibrium movement of Na+ between the extracellular medium and the central cavity of the channel. Analysis of Na+ dynamics reveals a knock-on mechanism of ion permeation characterized by alternating occupancy of the channel by 2 and 3 Na+ ions, with a computed rate of translocation of (6 ± 1) × 106 ions?s?1 that is consistent with expectations from electrophysiological studies. The binding of Na+ is intimately coupled to conformational isomerization of the four E177 side chains lining the extracellular end of the selectivity filter. The reciprocal coordination of variable numbers of Na+ ions and carboxylate groups leads to their condensation into ionic clusters of variable charge and spatial arrangement. Structural fluctuations of these ionic clusters result in a myriad of ion binding modes and foster a highly degenerate, liquid-like energy landscape propitious to Na+ diffusion. By stabilizing multiple ionic occupancy states while helping Na+ ions diffuse within the selectivity filter, the conformational flexibility of E177 side chains underpins the knock-on mechanism of Na+ permeation. PMID:23803856

  20. Catalysis of Na+ permeation in the bacterial sodium channel Na(V)Ab.

    PubMed

    Chakrabarti, Nilmadhab; Ing, Christopher; Payandeh, Jian; Zheng, Ning; Catterall, William A; Pomès, Régis

    2013-07-01

    Determination of a high-resolution 3D structure of voltage-gated sodium channel Na(V)Ab opens the way to elucidating the mechanism of ion conductance and selectivity. To examine permeation of Na(+) through the selectivity filter of the channel, we performed large-scale molecular dynamics simulations of Na(V)Ab in an explicit, hydrated lipid bilayer at 0 mV in 150 mM NaCl, for a total simulation time of 21.6 ?s. Although the cytoplasmic end of the pore is closed, reversible influx and efflux of Na(+) through the selectivity filter occurred spontaneously during simulations, leading to equilibrium movement of Na(+) between the extracellular medium and the central cavity of the channel. Analysis of Na(+) dynamics reveals a knock-on mechanism of ion permeation characterized by alternating occupancy of the channel by 2 and 3 Na(+) ions, with a computed rate of translocation of (6 ± 1) × 10(6) ions?s(-1) that is consistent with expectations from electrophysiological studies. The binding of Na(+) is intimately coupled to conformational isomerization of the four E177 side chains lining the extracellular end of the selectivity filter. The reciprocal coordination of variable numbers of Na(+) ions and carboxylate groups leads to their condensation into ionic clusters of variable charge and spatial arrangement. Structural fluctuations of these ionic clusters result in a myriad of ion binding modes and foster a highly degenerate, liquid-like energy landscape propitious to Na(+) diffusion. By stabilizing multiple ionic occupancy states while helping Na(+) ions diffuse within the selectivity filter, the conformational flexibility of E177 side chains underpins the knock-on mechanism of Na(+) permeation. PMID:23803856

  1. Instantánea del cáncer de seno (mama)

    Cancer.gov

    Información sobre las tendencias de incidencia, mortalidad y financiamiento del NCI sobre el cáncer de seno (mama); así como ejemplos de actividades del NCI y adelantos en la investigación de este tipo de cáncer.

  2. conomicas.a.esconomicasaes gua del estudiante

    E-print Network

    Escolano, Francisco

    Calendario Académico 2012/13 ..............................................9 Plan de estudios del Grado en Información del Plan de Estudios............................................................. 11 Asignaturas puedes cambiar la contraseña. La contraseña es personal e intransferible. En caso de olvido

  3. Hydrogen-fluorine exchange in NaBH4-NaBF4.

    PubMed

    Rude, L H; Filsø, U; D'Anna, V; Spyratou, A; Richter, B; Hino, S; Zavorotynska, O; Baricco, M; Sørby, M H; Hauback, B C; Hagemann, H; Besenbacher, F; Skibsted, J; Jensen, T R

    2013-11-01

    Hydrogen-fluorine exchange in the NaBH4-NaBF4 system is investigated using a range of experimental methods combined with DFT calculations and a possible mechanism for the reactions is proposed. Fluorine substitution is observed using in situ synchrotron radiation powder X-ray diffraction (SR-PXD) as a new Rock salt type compound with idealized composition NaBF2H2 in the temperature range T = 200 to 215 °C. Combined use of solid-state (19)F MAS NMR, FT-IR and DFT calculations supports the formation of a BF2H2(-) complex ion, reproducing the observation of a (19)F chemical shift at -144.2 ppm, which is different from that of NaBF4 at -159.2 ppm, along with the new absorption bands observed in the IR spectra. After further heating, the fluorine substituted compound becomes X-ray amorphous and decomposes to NaF at ~310 °C. This work shows that fluorine-substituted borohydrides tend to decompose to more stable compounds, e.g. NaF and BF3 or amorphous products such as closo-boranes, e.g. Na2B12H12. The NaBH4-NaBF4 composite decomposes at lower temperatures (300 °C) compared to NaBH4 (476 °C), as observed by thermogravimetric analysis. NaBH4-NaBF4 (1:0.5) preserves 30% of the hydrogen storage capacity after three hydrogen release and uptake cycles compared to 8% for NaBH4 as measured using Sievert's method under identical conditions, but more than 50% using prolonged hydrogen absorption time. The reversible hydrogen storage capacity tends to decrease possibly due to the formation of NaF and Na2B12H12. On the other hand, the additive sodium fluoride appears to facilitate hydrogen uptake, prevent foaming, phase segregation and loss of material from the sample container for samples of NaBH4-NaF. PMID:24071912

  4. Na+-mediated piezoprotection in Rhodotorula rubra.

    PubMed

    Aertsen, Abram; Masschalck, Barbara; Wuytack, Elke Y; Michiels, Chris W

    2003-12-01

    Sodium concentrations as low as 2 mM exerted a significant protective effect on the high-pressure inactivation (160-210 MPa) of Rhodotorula rubra at pH 6.5, but not on two other yeasts tested (Schizosaccharomyces pombe and Saccharomyces cerevisiae). A piezoprotective effect of similar magnitude was observed with Li+ (2 and 10 mM), and at elevated pH (8.0-9.0), but no effect was seen with K+, Ca2+, Mg2+, Mn2+, or NH4(+). Intracellular Na+ levels in cells exposed to low concentrations of Na+ or to pH 8.0-9.0 provided evidence for the involvement of a plasma membrane Na+/H+ antiporter and a correlation between intracellular Na+ levels and pressure resistance. The results support the hypothesis that moderate high pressure causes indirect cell death in R. rubra by inducing cytosolic acidification. PMID:14520537

  5. Nanosegregation in Na2C60

    SciTech Connect

    Klupp, G.; Kamaras, K.; Matus, P.; Kiss, L.F.; Kovats, E.; Pekker, S. [Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest (Hungary); Nemes, N.M. [Instituto de Ciencia de Materiales de Madrid, Cantoblanco, 28049 Madrid (Spain); Quintavalle, D.; Janossy, A. [Department of Experimental Physics, Budapest University of Technology and Economics, Budafoki ut 8, Budapest, H-1111 (Hungary)

    2005-09-27

    There is continuous interest in the nature of alkali metal fullerides containing C{sub 60}{sup 4-} and C{sub 60}{sup 2-}, because these compounds are believed to be nonmagnetic Mott-Jahn-Teller insulators. This idea could be verified in the case of A4C60, but Na2C60 is more controversial. By comparing the results of infrared spectroscopy and X-ray diffraction, we found that Na2C60 is segregated into 3-10 nm large regions. The two main phases of the material are insulating C60 and metallic Na3C60. We found by neutron scattering that the diffusion of sodium ions becomes faster on heating. Above 470 K Na2C60 is homogeneous and we show IR spectroscopic evidence of a Jahn-Teller distorted C{sub 60}{sup 2-} anion.

  6. NUEVA CONCEPCIÓN DEL TÉRMINO “INTELIGENCIA”

    Microsoft Academic Search

    Nelky Urrutia Amable

    2010-01-01

    El presente artículo aborda uno de los temas más controversiales del siglo XXI: la influencia de la Inteligencia Emocional en el liderazgo. Este tema reafirma el valor esencial de las habilidades emocionales en todas las funciones y desafíos que deben enfrentar los líderes en el mundo actual; llevándonos a la conclusión de que el éxito profesional está ligado a un

  7. Del crecimiento al desarrollo sostenible

    Microsoft Academic Search

    Lester R. Brown; Sandra Postel; Christopher Flavin

    1992-01-01

    Introducción. Durante gran parte de este siglo los debates económicos se han centrado en la cuestión de si el capitalismo o el socialismo es el mejor procedimiento para la organización de una economía industrial moderna. Esa dsicusión parece haber terminado porque las naciones de Europa Oriental avanzan con rapidez hacia los mecanismos del mercado y la economía soviética se tambalea

  8. Lecciones del de comerciode la

    E-print Network

    Tufts University

    boston University the frederick s. pardee center Universidad nacional aUtónoma de méxico centro de estUdios Derecho de autor y, en su caso, por los tratados internacionales aplicables. IMPRESO EN MÉXICO PRINTED Estudios del Desarrollo Universidad nacional aUtónoma de méxico, Centro de Estudios China-México t

  9. Analisis del sistema Paraguayo de investigacion agropecuaria

    Microsoft Academic Search

    Javier M. Ekboir; Gabriel H. Parellada; Andres Molina; Cesar Duarte

    2003-01-01

    En la d?cada del 90, el Gobierno paraguayo implement?, con poco ?xito, varios planes de reforma del Estado. Actualmente conviven en Paraguay un Estado muy centralizado, con poca capacidad de implementar pol?ticas modernas, y una econom?a muy descentralizada (a veces completamente fuera del control del gobierno y de la polic?a), que evoluciona gracias a las acciones e interacciones de agentes

  10. ASSIGNACI DEL COMPLEMENT BSIC DOCENT CONVOCATRIA 2010

    E-print Network

    Politècnica de Catalunya, Universitat

    ASSIGNACI� DEL COMPLEMENT B�SIC DOCENT CONVOCAT�RIA 2010 Acord núm.113/2011 del Consell de Govern pel qual s'aprova l'assignació del complement bàsic docent. Convocatòria 2010. · Document aprovat per'Avaluació Juliol de 2011 ASSIGNACI� DEL COMPLEMENT B�SIC DOCENT CONVOCAT�RIA 2010 Antecedents El Reial Decret 1086

  11. Consejo Social Principales acuerdos de las sesiones del pleno del Consejo Social durante el curso

    E-print Network

    Oro, Daniel

    Consejo Social Principales acuerdos de las sesiones del pleno del Consejo Social durante el curso del curso 2011-12. Ratificación del acuerdo de la Comisión Permanente sobre premios de investigación para estudiantes de segundo curso de bachillerato y de segundo curso de ciclos for- mativos de grado

  12. PROGRAMA DE MOBILITAT DEL CURS 20__/20__ PROGRAMA DE MOBILIDAD DEL CURSO 20__/20__

    E-print Network

    Oro, Daniel

    PROGRAMA DE MOBILITAT DEL CURS 20__/20__ PROGRAMA DE MOBILIDAD DEL CURSO 20__/20__ 1.2. DNI 0 1 2 3 del període de mobilitat / Duración del período de movilidad Tot el curs / Todo el curso dd mmdd mm aa Programa orientativo Curso de idioma Acte de benvinguda / Sessió informativa / Molt satisfet/a / Muy

  13. Self Interacting Markov chains P. Del Moral

    E-print Network

    Del Moral , Pierre

    Self Interacting Markov chains P. Del Moral Centre INRIA Bordeaux-Sud Ouest S´eminaire de l works with Bercu & Doucet, HAL-INRIA preprints (2008). P. Del Moral (INRIA Bordeaux) INRIA Centre interacting Markov chains 4 Interacting MCMC models P. Del Moral (INRIA Bordeaux) INRIA Centre Bordeaux

  14. Self Interacting Markov chains P. Del Moral

    E-print Network

    Del Moral , Pierre

    Self Interacting Markov chains P. Del Moral Centre INRIA Bordeaux-Sud Ouest Stochastic Analysis of joint works with Bercu & Doucet, HAL-INRIA preprints (2008). P. Del Moral (INRIA Bordeaux) INRIA Centre interacting Markov chains 4 Interacting MCMC models P. Del Moral (INRIA Bordeaux) INRIA Centre Bordeaux

  15. Self Interacting Markov chains P. Del Moral

    E-print Network

    Del Moral , Pierre

    Self Interacting Markov chains P. Del Moral Centre INRIA Bordeaux-Sud Ouest Mathematical Institute works with Bercu & Doucet, HAL-INRIA preprints (2008). P. Del Moral (INRIA Bordeaux) INRIA Centre interacting Markov chains 4 Interacting MCMC models P. Del Moral (INRIA Bordeaux) INRIA Centre Bordeaux

  16. SERVICIO DE DEPORTES NORMATIVA DE USO DEL

    E-print Network

    Escolano, Francisco

    SERVICIO DE DEPORTES NORMATIVA DE USO DEL SERVICIO DE FISIOTERAPIA #12;ÍNDICE EXPOSICIÓN DE MOTIVOS..................................................................................... 4 #12;NORMATIVA DE USO DEL SERVICIO DE FISIOTERAPIA VICERRECTORADO DE CULTURA, DEPORTES Y POLÍTICA LINGÜÍSTICA 3 EXPOSICIÓN DE MOTIVOS La presente normativa pretende regular el uso del Servicio de Fisioterapia

  17. CONCENTRADO DE LA INFORMACIN NOMBRE DEL PROYECTO

    E-print Network

    Bor, Gil

    experiencias de manera sostenible. Para ello, el desarrollo del senderismo en el Parque Ecológico "El Orito1 CONCENTRADO DE LA INFORMACIÓN NOMBRE DEL PROYECTO: DESARROLLO DEL ECOTURISMO EN EL PARQUE Guanajuato por conducto de la sub- Dirección de Ecología, adscrita a la Dirección General de Desarrollo

  18. EVOLUZIONE-WEB -1 -Evoluzione del Web

    E-print Network

    De Antonellis, Valeria

    EVOLUZIONE-WEB - 1 - Evoluzione del Web (fonte prof. Polillo) #12;- 2 - L'evoluzione del web EVOLUZIONE-WEB · Dal primo sito Web (1991) il Web è in continua crescita, e in continua evoluzione tecnologia, il mercato, i comportamenti delle persone · Le fasi della storia del Web: Web 1.0, Web 2.0, il

  19. Determination of Na acceptor level in Na+ ion-implanted ZnO single crystal

    NASA Astrophysics Data System (ADS)

    Wang, Zheng; Liu, Huibin; He, Haiping; Huang, Jingyun; Chen, Lingxiang; Ye, Zhizhen

    2015-03-01

    Ion implantation was used to dope Na acceptor into ZnO single crystals. With three mixed implantation energies, uniform depth distribution of Na ion in the surface region (~300 nm) of ZnO bulk crystals is achieved. Via post-implantation annealing, a donor-acceptor pair recombination band is identified in the low-temperature photoluminescence spectra, from which the energy level of Na-related acceptor in single crystalline ZnO is estimated to be 300 meV. A p-n junction based on this ZnO-Na layer shows rectifying characteristics, confirming the p-type conductivity.

  20. Comparative aspects of Na+/K+ pump-mediated uncoupled Na+ efflux in red blood cells and kidney proteoliposomes.

    PubMed Central

    Martin, W H; Richards, D E; Marín, R; Jack-Hays, M; Hoffman, J F

    1994-01-01

    Ouabain-sensitive uncoupled Na+ efflux has been studied in human, pig, and rat red cells and in vesicles containing reconstituted kidney Na+/K+ pumps obtained from these same species. The red cells from the different species gave qualitatively similar results; the uncoupled Na+ efflux was 15-30% of the Na+/K+ exchange rate, and this flux was inhibited at 5 mM extracellular Na+ (Na+o). At higher levels of Na+o there was a monotonic increase in the Na+ efflux. As has previously been observed in human red cells, the uncoupled efflux from pig red cells consists of Na+ and anion cotransport, suggesting that anion cotransport may be a general characteristic of uncoupled Na+ efflux in red cells. The uncoupled Na+ efflux carried out by pig and rat kidney Na+/K+ pumps differs from the red cell activity in that it represents no more than 2-4% of the Na+/K+ exchange rate and that 5 mM Na+o does not inhibit this efflux. Furthermore, the efflux does not appear to be dependent on anion cotransport. Vesicles containing human kidney Na+/K+ pumps differ from vesicles derived from pig or rat kidneys in that the Na+ efflux is not inhibited or stimulated by Na+ present on the opposite side; it thus appears that the Na+,K(+)-ATPase in these vesicles may be incapable of Na+/Na+ exchange. These results indicate that the ligand and kinetic properties of the uncoupled Na+ efflux mode of red cells are markedly different from kidney-derived Na+/K+ pumps reconstituted into proteoliposomes. The basis for these differences may be inherent in the Na+/K+ pumps themselves or represent differences between the two types of preparations studied. PMID:7937910

  1. Lab. 1 -Entorno del laboratorio Lab 1. -Entorno del laboratorio

    E-print Network

    Politècnica de Catalunya, Universitat

    hi ha una descripció general de la configuració de l'entorn que es farà servir per fer les pràctiques les aplicacions que es faran servir habitualment estan a la part de sota de l'escriptori: Aquestes són que farem servir en les pràctiques. ttyS0 e0 e1 e2 #12;Lab. 1 - Entorno del laboratorio 6 1.3. Quagga

  2. Jpi assignments in 25Na from 23Na(t, p)

    Microsoft Academic Search

    H. T. Fortune; R. Middleton; J. D. Garrett; R. M. Dreizler

    1978-01-01

    Results of the 23Na(t, p)25Na reaction establish Jpi = 3\\/2+ for the 90-keV state, confirm 3\\/2+ for the 2200-keV level, and establish positive parity (with J = 7\\/2 preferred) for the 2790-keV state.

  3. Na clusters on metal supported Ar layers

    NASA Astrophysics Data System (ADS)

    Faber, B.; Dinh, P. M.; Reinhard, P. G.; Suraud, E.

    2012-07-01

    We investigate from a theoretical perspective structure and dynamics of Na clusters on a surface built from Ar layers grown on a metal support. The system is modeled by a hierarchical quantum-mechanical/molecular-mechanical (QM/MM) approach treating the cluster electrons with time-dependent density-functional theory, the Ar atoms classically, and the metal support as a continuous dielectric medium. Caution has been taken to describe properly the dynamical polarizability of the Ar substrate. We study the effect of the Ar substrate and particularly of the metal support on the cluster structure and dynamics. The binding of Na6 and Na8 to the Ar surface is found to by very weak and the effect of the dielectric response of the metal (DRM) turns out to be negligible. The global properties of the optical response of the Na clusters are slightly changed by the Ar substrate and the DRM while the detailed spectral fragmentation depends sensitively on any change of the environment. The deposition dynamics of small Na clusters is crucially influenced by the mechanical hardness of the metal support while the DRM makes little effect. We also study the dependence on the number of Ar layers. For the first few layers (from two to four), the deposition dynamics changes dramatically with the number of layers. The results stabilize from six layers on upwards.

  4. The voltage-gated Na channel NaVBP has a role in motility, chemotaxis, and pH homeostasis

    E-print Network

    Clapham, David E.

    The voltage-gated Na channel NaVBP has a role in motility, chemotaxis, and pH homeostasisH homeostasis at high pH. Reduced motility of bacteria lacking functional NaVBP was reversed by restoration in response to chemoeffectors. Mutants lacking functional NaVBP were also defective in pH homeostasis

  5. Involvement of na in active uptake of pyruvate in mesophyll chloroplasts of some c(4) plants : na/pyruvate cotransport.

    PubMed

    Ohnishi, J; Flügge, U I; Heldt, H W; Kanai, R

    1990-11-01

    An artificial Na(+) gradient across the envelope (Na(+) jump) enhanced pyruvate uptake in the dark into mesophyll chloroplasts of a C(4) plant, Panicum miliaceum (NAD-malic enzyme type) (J Ohnishi, R Kanai [1987] FEBS Lett 219:347). In the present study, (22)Na(+) and pyruvate uptake were examined in mesophyll chloroplasts of several species of C(4) plants. Enhancement of pyruvate uptake by a Na(+) jump in the dark was also seen in mesophyll chloroplasts of Urochloa panicoides and Panicum maximum (phosphoenolpyruvate carboxykinase types) but not in Zea mays or Sorghum bicolor (NADP-malic enzyme types). In mesophyll chloroplasts of P. miliaceum and P. maximum, pyruvate in turn enhanced Na(+) uptake in the dark when added together with Na(+). When flux of endogenous Na(+) was measured in these mesophyll chloroplasts preincubated with (22)Na(+), pyruvate addition induced Na(+) influx, and the extent of the pyruvate-induced Na(+) influx positively correlated with that of pyruvate uptake. A Na(+)/H(+) exchange ionophore, monensin, nullified all the above mutual effects of Na(+) and pyruvate in mesophyll chloroplasts of P. miliaceum, while it accelerated Na(+) uptake and increased equilibrium level of chloroplast (22)Na(+). Measurements of initial uptake rates of pyruvate and Na(+) gave a stoichiometry close to 1:1. These results point to Na(+)/pyruvate cotransport into mesophyll chloroplasts of some C(4) plants. PMID:16667876

  6. Sodium-difluoro(oxalato)borate (NaDFOB): a new electrolyte salt for Na-ion batteries.

    PubMed

    Chen, Juner; Huang, Zhenguo; Wang, Caiyun; Porter, Spencer; Wang, Baofeng; Lie, Wilford; Liu, Hua Kun

    2015-06-01

    A new electrolyte salt, sodium-difluoro(oxalato)borate (NaDFOB), was synthesized and studied, which enables excellent reversible capacity and high rate capability when used in Na/Na0.44MnO2 half cells. NaDFOB has excellent compatibility with various common solvents used in Na-ion batteries, in strong contrast to the solvent dependent performances of NaClO4 and NaPF6. In addition, NaDFOB possesses good stability and generates no toxic or dangerous products when exposed to air and water. All these properties demonstrate that NaDFOB could be used to prepare high performance electrolytes for emerging Na-ion batteries. PMID:25987231

  7. Na+/K+-ATPase: Activity and inhibition

    NASA Astrophysics Data System (ADS)

    ?olovi?, M.; Krsti?, D.; Krinulovi?, K.; Momi?, T.; Savi?, J.; Vuja?i?, A.; Vasi?, V.

    2009-09-01

    The aim of the study was to give an overview of the mechanism of inhibition of Na+/K+-ATPase activity induced by some specific and non specific inhibitors. For this purpose, the effects of some ouabain like compounds (digoxin, gitoxin), noble metals complexes ([PtCl2DMSO2], [AuCl4]-, [PdCl4]2-, [PdCl(dien)]+, [PdCl(Me4dien)]+), transition metal ions (Cu2+, Zn2+, Fe2+, Co2+), and heavy metal ions (Hg2+, Pb2+, Cd2+) on the activity of Na+/K+-ATPase from rat synaptic plasma membranes (SPM), porcine cerebral cortex and human erythrocytes were discussed.

  8. Semisynthesis of NaK; a Na+ and K+ conducting ion channel

    PubMed Central

    Linn, Kellie M.; Derebe, Mehebaw G.; Jiang, Youxing; Valiyaveetil, Francis I.

    2010-01-01

    In this contribution, we describe the semisynthesis of NaK, a bacterial non-selective cation channel. In the semisynthesis, the NaK polypeptide is assembled from a recombinantly expressed thioester peptide and a chemically synthesized peptide using the native chemical ligation reaction. We describe a temporary tagging strategy for the purification of the hydrophobic synthetic peptide and demonstrate the efficient ligation of the synthetic peptide with the recombinant peptide thioester to form the semisynthetic NaK polypeptide. Following assembly, the NaK polypeptide is folded in vitro to the native state using lipid vesicles. Functional characterization of the folded semisynthetic NaK channels indicates that it is functionally similar to the wild type protein. We used semisynthesis to substitute aspartate 66 in the selectivity filter region of the NaK channel with the unnatural amino acids, homoserine and cysteine sulfonic acid. Functional analysis of these mutants suggests that the presence of a negatively charged residue in the vicinity of the ion binding sites is necessary for optimal flux of ions through the NaK channel. PMID:20415433

  9. Na+ inhibits the epithelial Na+ channel by binding to a site in an extracellular acidic cleft.

    PubMed

    Kashlan, Ossama B; Blobner, Brandon M; Zuzek, Zachary; Tolino, Michael; Kleyman, Thomas R

    2015-01-01

    The epithelial Na(+) channel (ENaC) has a key role in the regulation of extracellular fluid volume and blood pressure. ENaC belongs to a family of ion channels that sense the external environment. These channels have large extracellular regions that are thought to interact with environmental cues, such as Na(+), Cl(-), protons, proteases, and shear stress, which modulate gating behavior. We sought to determine the molecular mechanism by which ENaC senses high external Na(+) concentrations, resulting in an inhibition of channel activity. Both our structural model of an ENaC ? subunit and the resolved structure of an acid-sensing ion channel (ASIC1) have conserved acidic pockets in the periphery of the extracellular region of the channel. We hypothesized that these acidic pockets host inhibitory allosteric Na(+) binding sites. Through site-directed mutagenesis targeting the acidic pocket, we modified the inhibitory response to external Na(+). Mutations at selected sites altered the cation inhibitory preference to favor Li(+) or K(+) rather than Na(+). Channel activity was reduced in response to restraining movement within this region by cross-linking structures across the acidic pocket. Our results suggest that residues within the acidic pocket form an allosteric effector binding site for Na(+). Our study supports the hypothesis that an acidic cleft is a key ligand binding locus for ENaC and perhaps other members of the ENaC/degenerin family. PMID:25389295

  10. Problemi di Ricerca relativi all'uso di ICT e Tecnologie Didattiche (TD) nella Ricerca in Didattica della Fisica Elena Sassi Dip. Scienze Fisiche Universit "Federico II" Napoli sassi@na.infn.it

    E-print Network

    Spagnolo, Filippo

    della Fisica (PER) Elena Sassi Dip. Scienze Fisiche Università "Federico II" Napoli sassi@na.infn.it ALCUNE NOTE SULLA PRESENTAZIONE DEL 19/06/2006 Pg 1 Alla ricerca in didattica della fisica (Physics; problemi attuali da risolvere; ... Le ricerche in didattica della fisica sono iniziate una quarantina di

  11. Organization Through participation in the Na-

    E-print Network

    Robeson, Scott M.

    Organization Through participation in the Na- tional Council on U.S.-Arab Re- lations' Model Arab League (MAL)programstudents learn about the politics and history of the Arab world, and the arts welcome universitiesand high schools from across the United States to participate. MODEL ARAB LEAGUE CALL

  12. MoNA—The Modular Neutron Array

    Microsoft Academic Search

    B. Luther; T. Baumann; M. Thoennessen; J. Brown; P. Deyoung; J. Finck; J. Hinnefeld; R. Howes; K. Kemper; P. Pancella; G. Peaslee; W. Rogers; S. Tabor

    2003-01-01

    The Modular Neutron Array (MoNA), a highly efficient time-of-flight neutron detector, is being constructed for use at the National Superconducting Cyclotron Laboratory. The modular design of the detector provides significant flexibility and allows the bulk of the assembly and testing to be done by undergraduates at nine of the schools participating in the project.

  13. master's degree NaNotechNology

    E-print Network

    Twente, Universiteit

    master's degree NaNotechNology When choosing a Master's programme, it is wise to look one step topical, incorporating the latest developments in applied physics, nanotechnology, chemical engineering projects will be carried out at the MESA+ institute for nanotechnology, or the MIRA institute

  14. Tierra del Fuego, Argentina, South America

    NASA Technical Reports Server (NTRS)

    1991-01-01

    The Mitre Peninsula is the easternmost tip of Tierra del Fuego, Argentina, (54.5S, 65.5W). Early winter snow can be seen on this south tip of the Andes Mountains. These same mountains continue underwater to Antarctica. The Strait of Magellan, separating the South American mainland from Tierra del Fuego is off the scene to the north and west, but the Strait of LeMaire, separating Tierra del Fuego from the Isla de los Estados can be seen.

  15. II Taller Centroamericano y del Caribe: Guatemala

    E-print Network

    Bravo-Elizondo, Pedro

    1991-10-01

    FALL 1991 151 II Taller Centroamericano y del Caribe: Guatemala Pedro Bravo-Elízondo En el mes de agosto de 1990, durante la primera asamblea general de la Coordinadora Centroamericana y del Caribe de Teatro, realizada en Tegucigalpa, Honduras..., se acordó que el II Taller se realizara en la ciudad de Guatemala, durante el mes de agosto de 1991. En el Centro Cultural de Guatemala, Miguel Ángel Asturias, se realizó la inauguración el domingo 4 de agosto, con la presentación del Ballet...

  16. Propostes i despropòsits: aspectes del gonellisme

    Microsoft Academic Search

    Guillem Calaforra; Sebastià Moranta

    2005-01-01

    Estudi sobre l'origen i la pervivència del gonellisme. Els autors n'exposen les constants ideològiques, que van del conservadorisme a l'extrema dreta, i fan una completa relació de les seves plataformes de difusió. L'anàlisi minuciosa d'aquest fenomen els porta a considerar el lligam entre el dialectalisme primigeni i el secessionisme anticatalanista que en deriva, així com a constatar la importància del

  17. Roberto Cossa habla del teatro

    E-print Network

    Magnarelli, Sharon

    1987-04-01

    no es un autor que me emocione. Hay gente que con Esperando a Godot ha salido realmente emocionada. A mi más bien me afecta en el sentido intelectual, pero reconozco que en El viejo 134 LATIN AMERICAN THEATRE REVIEW criado con esos dos personajes, en... de inteligencia, y, aparte, de frecuencia del teatro muy grande. Después todo es muy rutinario. Es decir, los críticos acá recurren todos al mismo sistema: hacen el análisis literario de una pieza, después la puesta, después los actores, y al final...

  18. Agenda de dos das de capacitacin (Para uso del representante) Antes del curso Inscripcin

    E-print Network

    curso Inscripción Verificación de la identidad (Licencia de manejar) Formularios de inscripción del: Actividad para romper el hielo Prueba antes del curso 45 minutos Sepa la realidad sobre la enfermedad de

  19. Laser trapping of {sup 21}Na atoms

    SciTech Connect

    Lu, Zheng-Tian

    1994-09-01

    This thesis describes an experiment in which about four thousand radioactive {sup 21}Na (t{sub l/2} = 22 sec) atoms were trapped in a magneto-optical trap with laser beams. Trapped {sup 21}Na atoms can be used as a beta source in a precision measurement of the beta-asymmetry parameter of the decay of {sup 21}Na {yields} {sup 21}Ne + {Beta}{sup +} + v{sub e}, which is a promising way to search for an anomalous right-handed current coupling in charged weak interactions. Although the number o trapped atoms that we have achieved is still about two orders of magnitude lower than what is needed to conduct a measurement of the beta-asymmetry parameter at 1% of precision level, the result of this experiment proved the feasibility of trapping short-lived radioactive atoms. In this experiment, {sup 21}Na atoms were produced by bombarding {sup 24}Mg with protons of 25 MeV at the 88 in. Cyclotron of Lawrence Berkeley Laboratory. A few recently developed techniques of laser manipulation of neutral atoms were applied in this experiment. The {sup 21}Na atoms emerging from a heated oven were first transversely cooled. As a result, the on-axis atomic beam intensity was increased by a factor of 16. The atoms in the beam were then slowed down from thermal speed by applying Zeeman-tuned slowing technique, and subsequently loaded into a magneto-optical trap at the end of the slowing path. The last two chapters of this thesis present two studies on the magneto-optical trap of sodium atoms. In particular, the mechanisms of magneto-optical traps at various laser frequencies and the collisional loss mechanisms of these traps were examined.

  20. Thermodynamics of Na 2 O-SiO 2 melts

    Microsoft Academic Search

    A. I. Zaitsev; N. E. Shelkova; B. M. Mogutnov

    2000-01-01

    The thermodynamic properties of Na2O-SiO2 solid (942-1285 K) and liquid (1103-1719 K, 19.5-61.8 mol % Na2O) silicates were studied by Knudsen cell mass spectrometry. To determine the activities of the constituent oxides, these\\u000a were reduced to volatile suboxides directly in effusion cells. Mass spectra of the saturated vapor over Na2O-SiO2 showed the presence of the Na+, Na2O+, NaO+, O\\u000a 2

  1. Reglament d'organitzaci i funcionament del departament d'Enginyeria del Terreny, Cartogrfica i Geofsica

    E-print Network

    Yannuzzi Sanchez, Marcelo

    ................................................................................................................................. 3 Article 3. Funcions..................................................................................................................................... 6 Article 14. Funcions del Consell ............................................................................................. 7 Article 16. Delegació de funcions

  2. Permissive effect of thyroid hormones on induction of rat colonic Na + transport by aldosterone is not localised at the level of Na + channel transcription

    Microsoft Academic Search

    Libor Mrnka; Ji??? Pácha

    2000-01-01

    The interrelationship between thyroid hormones and aldosterone has been examined in the regulation of rat colonic amiloride-sensitive Na+ transport which translocates Na+ through apical amiloride-sensitive Na+ channels and basolateral Na+,K+-ATPase. Electrogenic Na+ transport was measured in an Ussing chamber by the short-circuit current and identified by Na+ channel blocker amiloride. Na+-pumping activity of the basolateral Na+,K+-ATPase was investigated in nystatin-treated

  3. rgano informativo del Colegio de Ciencias y Humanidades Suplemento especial

    E-print Network

    Islas, León

    Número 3 9 de mayo de 2011 Órgano informativo del Colegio de Ciencias y Humanidades SuplementoCCHSuplementoespecialnúmero3,9demayode20114 La Dirección General del Colegio de Ciencias y Humanidades, a través del elementos básicos del método epidemi- ológico para su aplicación en curso de Ciencias de la Salud, del nivel

  4. Pla Estratgic del Servei d'Alumnat Setembre 2007 1

    E-print Network

    Escolano, Francisco

    Pla Estratègic del Servei d'Alumnat Setembre 2007 1 PLA ESTRATÈGIC DE GESTIÓ SERVEI D'ALUMNAT #12;Pla Estratègic del Servei d'Alumnat Setembre 2007 2 INTRODUCCIÓ La presentació del Pla Estratègic de i l'establiment del marc per al Pla Estratègic de la Universitat d'Alacant. El Pla Estratègic del

  5. Regolamento del Collegio dei Direttori di Dipartimento (DR 769 del 21/12/2010)

    E-print Network

    Guidoni, Leonardo

    Regolamento del Collegio dei Direttori di Dipartimento (DR 769 del 21/12/2010) Titolo I Principi generali ART. 1 Composizione e compiti del Collegio dei Direttori di Dipartimento Il Collegio dei Direttori interdipartimentale con funzioni di raccordo delle politiche per il raggiungimento delle finalità istituzionali dei

  6. PER A UNA PEDAGOGIA DEL LABERINT del text: l'autor, 2008

    E-print Network

    Oro, Daniel

    PER A UNA PEDAGOGIA DEL LABERINT #12;© del text: l'autor, 2008 © de l'edició: Universitat de les Palma DL: PM 1835-2008 #12;PER A UNA PEDAGOGIA DEL LABERINT He triat per a aquesta ocasió reflexionar vostre inclou el camp de la teoria, però també, i en gran manera, el de la pràctica, ja que en pedagogia

  7. Aprovaci de l'actualitzaci del sistema de punts d'activitat acadmica del PDI

    E-print Network

    Yannuzzi Sanchez, Marcelo

    Aprovació de l'actualització del sistema de punts d'activitat acadèmica del PDI Acord núm.150 PDI · Document proposta informat favorablement per la Comissió de Personal i Acció Social celebrada el SISTEMA DE PUNTS D'ACTIVITAT ACADÈMICA DEL PDI Introducció El Consell de Govern va aprovar, en la sessió

  8. [Gating properties of cardiac Na channels: from the macroscopic Na current viewpoint].

    PubMed

    Sada, H; Ban, T; Ebina, Y

    1993-08-01

    The sodium channel plays essential roles in the initiation and propagation of action potentials (APs) in excitable tissues including the heart, nerves, and muscles. Na channels in these tissues undergo so-called activation and then inactivation upon step-depolarizations of the cell membrane. Hodgkin and Huxley, early in the 1950s, proposed a mathematical model to describe such events, which was based on voltage-clamp (V-C) data on axonal membranes. However, for the next 30 years or so since the pioneering work of the above workers, electrophysiological studies of the Na channel kinetics in the heart had relied exclusively on AP data (Vmax) as an indirect measure of the Na current instead of V-C data due to difficulty in determining V-C from the complex geometry of cardiac tissues. However, recent development of an isolation procedure for preparing single heart cells and the use of single patch-pipettes for high resolution V-C experiments on these cells have made direct recording of Na channel currents also possible in the heart. Voltage-clamp studies carried out for the last decade have provided several lines of evidence supporting the view that the Na channel properties in the heart of any animal species are somehow more complex than in the axonal membrane and hence showing that Hodgkin-Huxley model can not be directly applied to describe the Na channel behavior in the former type of tissues. Here, we review recent results from V-C studies on Na channel properties with special reference to the macroscopic Na current in cardiac tissues. PMID:8396556

  9. Studies of Inelastic Collisions of NaK and NaCs Molecules with Atomic Perturbers

    NASA Astrophysics Data System (ADS)

    Jones, Joshua A.

    We have investigated collisions of NaK molecules in the first excited state [2(A)1Sigma+], with Ar and He collision partners using laser-induced fluorescence spectroscopy (LIF) and polarization-labeling (PL) spectroscopy in a two-step excitation scheme. Additionally, we have investigated collisions of NaCs molecules in the first excited state [2(A)1Sigma +] with Ar and He perturbers using the LIF technique. We use a pump-probe, two-step excitation process. The pump laser prepares the molecule in a particular ro-vibrational (v, J) level in the A state. The probe laser frequency is scanned over transitions to the 31? in NaK or to the 53? in NaCs. In addition to observing strong direct lines, we also see weak collisional satellite lines that arise from collisions in the intermediate state that take the molecule from the prepared level (v, J) to level (v, J + Delta J). The ratio of the intensity of the collisional line to the intensity of the direct line in LIF and PL yield information about population and orientation transfer. Our results show a propensity for DeltaJ=even collisions of NaK with Ar and an even stronger propensity for collisions with He. Collisions of NaCs with Ar do not show any such J=even propensity. Preliminary investigations of collisions of NaCs with He seem to indicate a slight J=even propensity. In addition, we observe that rotationally inelastic collisions of excited NaK molecules with potassium atoms destroy almost all of the orientation, while collisions with argon destroy about one third to two thirds and collisions with helium destroy only about zero to one third of the initial orientation.

  10. Evolución morfodinámica de un enclave montañoso recién deglaciado: el caso del Corral del Veleta (Sierra Nevada), ¿consecuencia del Cambio Climático?

    Microsoft Academic Search

    Antonio Gómez Ortiz; Ferran Salvador Franch; Lothar Schulte; José Juan de Sanjosé Blasco; Alan Atkinson Gordo; David Palacios Estremera

    2008-01-01

    El Corral del Veleta (Sierra Nevada. España) cobija en su seno y bajo manto detrítico hielo glaciar fósil y permafrost alpino, restos, como mínimo, de la Pequeña Edad del Hielo (siglos XV\\/XIX). En la actualidad, estas masas heladas se encuentran en proceso de degradación. Los análisis y controles que desde 2001 se vienen llevando a cabo en un glaciar rocoso

  11. Intracellular Na+ regulation of Na+ pump sites in cultured vascular smooth muscle cells

    SciTech Connect

    Allen, J.C.; Navran, S.S.; Seidel, C.L.; Dennison, D.K.; Amann, J.M.; Jemelka, S.K.

    1989-04-01

    Enzymatically dispersed cells from canine saphenous vein and femoral artery were grown in fetal calf serum and studied at day 0 (freshly dispersed) through confluence in primary culture. Intracellular Na levels (Nai), but not intracellular K (Ki), were increased after 24 h in culture and then decreased to a steady state by 4 days. Na+ pump site number (( /sup 3/H) ouabain binding) increased through day 3 and remained elevated. Nai was still elevated at 2 days when the Na+ pump site number began to increase. Total pump turnover (maximum ouabain-inhibited /sup 86/Rb uptake) reflected the increase in Na+ pump site number. These key events precede the observed increases in both protein production and cellular proliferation. If the same cells are maintained in defined medium, without fetal calf serum, Nai, Ki, and the number of (/sup 3/H)ouabain binding sites do not change with time. These data are consistent with the suggestion that the initial mitogenic response of vascular smooth muscle cells to fetal calf serum involves an increased Na+ influx, and a Nai accumulation, caused by low Na+ pump density. The synthesis of new pump sites effects a decrease in the accumulated Nai, which may be related to cell proliferation.

  12. Na/beta-alumina/NaAlCl4, Cl2/C circulating cell

    NASA Technical Reports Server (NTRS)

    Cherng, Jing-Yih; Bennion, Douglas N.

    1987-01-01

    A study was made of a high specific energy battery based on a sodium negative electrode and a chlorine positive electrode with molten AlCl3-NaCl electrolyte and a solid beta alumina separator. The basic performance of a Na beta-alumina NaAlCl4, Cl2/C circulating cell at 200 C was demonstrated. This cell can be started at 150 C. The use of melting sodium chloroaluminate electrolyte overcomes some of the material problems associated with the high working temperatures of present molten salt systems, such as Na/S and LiAl/FeS, and retains the advantages of high energy density and relatively efficient electrode processes. Preliminary investigations were conducted on a sodium-chlorine static cell, material compability, electrode design, wetting, and theoretical calculations to assure a better chance of success before assembling a Na/Cl2 circulating cell. Mathematical models provide a theoretical explanation for the performance of the NaCl2 battery. The results of mathematical models match the experimental results very well. According to the result of the mathematical modeling, an output at 180 mA/sq cm and 3.2 V can be obtained with optimized cell design.

  13. An enhancement to the NA4 gear vibration diagnostic parameter

    NASA Technical Reports Server (NTRS)

    Decker, Harry J.; Handschuh, Robert F.; Zakrajsek, James J.

    1994-01-01

    A new vibration diagnostic parameter for health monitoring of gears, NA4*, is proposed and tested. A recently developed gear vibration diagnostic parameter NA4 outperformed other fault detection methods at indicating the start and initial progression of damage. However, in some cases, as the damage progressed, the sensitivity of the NA4 and FM4 parameters tended to decrease and no longer indicated damage. A new parameter, NA4* was developed by enhancing NA4 to improve the trending of the parameter. This allows for the indication of damage both at initiation and also as the damage progresses. The NA4* parameter was verified and compared to the NA4 and FM4 parameters using experimental data from single mesh spur and spiral bevel gear fatigue rigs. The primary failure mode for the test cases was naturally occurring tooth surface pitting. The NA4* parameter is shown to be a more robust indicator of damage.

  14. Rechargeable Na/Na0.44MnO2 cells with ionic liquid electrolytes containing various sodium solutes

    NASA Astrophysics Data System (ADS)

    Wang, Chueh-Han; Yeh, Yu-Wen; Wongittharom, Nithinai; Wang, Yi-Chen; Tseng, Chung-Jen; Lee, Sheng-Wei; Chang, Wen-Sheng; Chang, Jeng-Kuei

    2015-01-01

    Orthorhombic Na0.44MnO2 with wide structural tunnels for sodium ion transport is synthesized. Butylmethylpyrrolidinium-bis(trifluoromethanesulfonyl)imide (BMP-TFSI) ionic liquid (IL) with various Na solutes, namely NaBF4, NaClO4, NaTFSI, and NaPF6, is used as an electrolyte for rechargeable Na/Na0.44MnO2 cells. The cell with NaClO4-incorporated IL electrolyte exhibits superior charge-discharge performance due to it having the lowest solid-electrolyte-interface resistance and charge transfer resistance at both the Na and Na0.44MnO2 electrodes. The IL electrolyte shows high thermal stability and is suitable for use at an elevated temperature. At 75 °C, the measured capacity of Na0.44MnO2 in the IL electrolyte with NaClO4 is as high as 115 mAh g-1 (at 0.05 C), which is close to the theoretical value (121 mAh g-1). Moreover, 85% of this capacity can be retained when the charge-discharge rate is increased to 1 C. These properties are superior to those of a conventional organic electrolyte.

  15. Reseña del VIII Festival Internacional de Teatro

    E-print Network

    Dí az, Né stor Gustavo

    1986-10-01

    , aparecieron de todos los lugares del país los grupos marginales en busca de espacios para mostrar sus realizaciones. En este campo se distinguió el grupo La Tarima de Medellín, dirigido por Elkín Giraldo, que se tomó la audiencia del Festival presentando...

  16. octubre 2007 Resumen de condiciones del

    E-print Network

    Rey Benayas, José María

    incluidos). Compra mínima, 4 unidades: 100 Menos de 10 unidades: 25 / De 10 a 50: 24 / De 51 a 200: 20 para evitar el cambio climático, la crisis ambiental y forestal, del periodista Jordi Bigues; la Guía Práctica de la Energía (IDAE); el dossier Cambia del Ministerio de Medio Ambiente... · Mediante la

  17. de Intercambio Estudiantil UNIVERSIDAD CATLICA DEL URUGUAY

    E-print Network

    Petriu, Emil M.

    Programa de Intercambio Estudiantil UNIVERSIDAD CATÓLICA DEL URUGUAY Nombre de la Universidad Universidad Católica del Uruguay Dámaso Antonio Larrañaga Oficina de Intercambio Estudiantil Secretaría 2738 C.P. 11600 Montevideo Uruguay E-mail interinter@ucu.edu.uy Página Web www.ucu.edu.uy Página Web

  18. SCHEMA STRATIGRAFICO E TETTONICO DEL CARSO ISONTINO

    Microsoft Academic Search

    Maurizio Tentor; Giorgio Tunis; Sandro Venturini

    The stratigraphic section and the tectonic sketch of the Isontino Karst (Gorizia) are herein briefly described . Some important bioevents are recognized and for the first time, aptian deposits are described. Premessa. Il Carso isontino è la propaggine nordoccidentale del Carso triestino-sloveno ed è delimitato ad occidente dall' Isonzo e dalla pianura friulana, a NE dalla Valle del Vipacco e

  19. Investigación sobre la detección del cáncer

    Cancer.gov

    De acuerdo con un estudio en el que participaron más de un millón de mujeres, los investigadores del NCI han determinado que el resultado negativo de una prueba para la detección del VPH proporciona mayor certeza o seguridad frente a riesgos futuros de cáncer de cuello uterino que una prueba de Pap.

  20. ESPECIALIZACIN EN GESTIN AMBIENTAL Objetivo del programa

    E-print Network

    Vásquez, Carlos

    , mitigación y resolución de problemas de carácter ambiental, a fin de contribuir con el desarrollo sostenible Asignaturas Unidades-Crédito Obligatorias (21 UC) Introducción al desarrollo sostenible 3 Evaluación del impacto ambiental del desarrollo 3 Política y legislación ambiental 3 Planificación y gestión ambiental

  1. Prot. n. 56 lordo del b

    E-print Network

    Guidoni, Leonardo

    la dura evisto dall'a nstaurati, ai rinnovi, non cui l'assegn ella durata le ordo annuo gli comun o è stato fru egale del rel è stabilito in arico del ben no, in mater e successiv di cui all assegno) ente essere 011. La dura a legge 240/ quattro ann l dottorato d vemilatrecen al beneficiar

  2. Bumetanide inhibition of NaCl transport by Necturus gallbladder

    Microsoft Academic Search

    Mikael Larson; Kenneth R. Spring

    1983-01-01

    Summary Salt transport by theNecturus gallbladder epithelium is the result of the coupled entry of NaCl into the cells across the apical membrane and the active transport of Na out of the cells across the basolateral membrane. The NaCl entry step was studied by measuring the rate of cell volume increase accompanying ouabain inhibition of the Na-K-ATPase in the basolateral

  3. Immunohistochemical localization of Na + -dependent glucose transporter in rat jejunum

    Microsoft Academic Search

    Kuniaki Takata; Toshiko Kasahara; Michihiro Kasahara; Osamu Ezaki; Hiroshi Hirano

    1992-01-01

    Glucose is actively absorbed via a Na+-dependent active glucose transporter (Na-GT) in the small intestine. We raised a polyclonal antibody against the peptide corresponding to amino acids 564–575 of rabbit intestinal Na-GT, and localized it immunohistochemically in the rat jejunum. By means of immunofluorescence staining, Na-GT was located at the brush border of the absorptive epithelial cells of the intestinal

  4. {beta} decay of {sup 32}Na

    SciTech Connect

    Mattoon, C. M. [Department of Physics, Colorado School of Mines, Golden, Colorado 80401 (United States); Sarazin, F. [Department of Physics, Colorado School of Mines, Golden, Colorado 80401 (United States); TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3 (Canada); Hackman, G.; Ball, G. C.; Chakrawarthy, R. S.; Scraggs, H. C.; Smith, M. B. [TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3 (Canada); Cunningham, E. S.; Walker, P. M. [TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3 (Canada); Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH (United Kingdom); Austin, R. A. E. [Department of Physics and Astronomy, Saint Mary's University, Halifax, Nova Scotia, Canada B3H 3C3 (Canada); Finlay, P.; Grinyer, G. F.; Hyland, B.; Phillips, A. A.; Schumaker, M. A.; Svensson, C. E. [Department of Physics, University of Guelph, Guelph, Ontario, Canada N1G 2W1 (Canada); Garrett, P. E. [TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3 (Canada); Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1 (Canada); Koopmans, K. A.; Waddington, J. C.; Washbrook, B. [Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4K1 (Canada)] (and others)

    2007-01-15

    The {beta}-decay of {sup 32}Na has been studied using {beta}-{gamma} coincidences. New transitions and levels are tentatively placed in the level scheme of {sup 32}Mg from an analysis of {gamma}-{gamma} and {beta}-{gamma}-{gamma} coincidences. The observation of the indirect feeding of the 2321 keV state in {sup 32}Mg removes some restrictions previously placed on the spin assignment for this state. No evidence of a state at 2117 keV in {sup 32}Mg is found. Previously unobserved weak transitions up to 5.4 MeV were recorded but could not be placed in the decay scheme of {sup 32}Na.

  5. Na+-driven bacterial flagellar motors.

    PubMed

    Imae, Y; Atsumi, T

    1989-12-01

    Bacterial flagellar motors are the reversible rotary engine which propels the cell by rotating a helical flagellar filament as a screw propeller. The motors are embedded in the cytoplasmic membrane, and the energy for rotation is supplied by the electrochemical potential of specific ions across the membrane. Thus, the analysis of motor rotation at the molecular level is linked to an understanding of how the living system converts chemical energy into mechanical work. Based on the coupling ions, the motors are divided into two types; one is the H+-driven type found in neutrophiles such as Bacillus subtilis and Escherichia coli and the other is the Na+-driven type found in alkalophilic Bacillus and marine Vibrio. In this review, we summarize the current status of research on the rotation mechanism of the Na+-driven flagellar motors, which introduces several new aspects in the analysis. PMID:2687262

  6. The complex lightcurve of 1992 NA

    NASA Technical Reports Server (NTRS)

    Wisniewski, Wieslaw Z.; Harris, A. W.

    1994-01-01

    Amor asteroid 1992 NA was monitored during three nights at a large phase angle of -65 deg. The lightcurves obtained did not reveal a repeatable curve with two maxima and two minima. However, some features suggested a periodicity with three maxima and three minima. A satisfactory composite lightcurve of this form was obtained by means of an 'eyeball' fit and by Fourier analysis. Individual and composite lightcurves are presented. The observed colors are consistent with the C class.

  7. The temperature dependence of the cross section for the energy pooling process Na(3P)+Na(3P) to Na(4D)+Na(3S)

    NASA Astrophysics Data System (ADS)

    Horvatic, V.; Movre, M.; Vadla, C.

    1999-10-01

    We report the measurements of the temperature dependence of the cross section ?4D for the energy pooling process Na(3P)+Na(3P) to Na(4D)+Na(3S). The latest two, as yet undisputed, results for ?4D obtained by different authors at T = 597 K and T = 483 K suggest that this cross section decreases with increasing T, which contradicts the theory and other experiments on similar processes. To resolve this controversy and to examine the temperature trend of the cross section, we have measured the ?4D in the temperature range 567-705 K, covering the high-temperature region that has not yet been investigated experimentally. To determine ?4D we have excited sodium atoms in the quasistatic wing of the D1 line using a cw dye laser and measured the fluorescence intensity for the 4D to 3P3/2 transition, relative to the intensity of the optically thin quasistatic wing of the D2 line. The spatial distribution of the number density of the sodium atoms in the 3P3/2 state and the sodium ground-state number density were measured too. The method used for the determination of the cross section is advantageous since it entirely circumvents the need to account for the radiation trapping of 3P level radiation, which was substantial under experimental conditions of the ground-state densities being 1014-1016 cm-3. The measurements of the cross section ?4D in the investigated temperature range have shown that it increases as ~exp(-? E/kT). From the experiment we obtained ? E = (608±95) cm-1, which is in excellent agreement with the energy defect (613 cm-1) for the considered process, and in fair agreement with the values which follow from recent theoretical calculations.

  8. New results from the NA57 experiment

    E-print Network

    G. E. Bruno; for the NA57 Collaboration

    2003-07-10

    We report results from the experiment NA57 at CERN SPS on hyperon production at midrapidity in Pb-Pb collisions at 158 $A$ GeV/$c$ and 40 $A$ GeV/$c$. $\\Lambda$, $\\Xi$ and $\\Omega$ yields are compared with those from the STAR experiment at the higher energy of the BNL RHIC. $\\Lambda$, $\\Xi$, $\\Omega$\\ and preliminary $K_S^0$ transverse mass spectra are presented and interpreted within the framework of a hydro-dynamical blast wave model.

  9. The NA49 large acceptance hadron detector

    Microsoft Academic Search

    S V Afanasiev; T. Alber; H. Appelshäuser; J. Bächler; D. Barna; L. S. Barnby; Jerzy Bartke; R. A. Barton; L. Betev; H. Bialkowska; F. Bieser; A. Billmeier; C. O. Blyth; R K Böck; C. Bormann; J. Bracinik; F. P. Brady; R. Brockmann; R. Brun; P. Buncic; H. L. Caines; D. Cebra; G. E. Cooper; J. G. Cramer; P. Csato; M. Cyprian; J. Dunn; V. Eckardt; F. Eckhardt; T. Empl; J. Eschke; M. I. Ferguson; H. Fessler; H. G. Fischer; D. Flierl; Z. Fodor; Ulrich Frankenfeld; P Y Foka; P. Freund; V. Friese; J. Ftacnik; M. Fuchs; F. Gabler; J. Gal; R E Ganz; M. Gazdzicki; E Gladysz-Dziadus; J. Grebieszkow; J. Günther; J. W. Harris; S. Hegyi; T. Henkel; L. A. Hill; V. Hlinka; I. Huang; H. Hümmler; G. Igo; D. Irmscher; M. Ivanov; R. Janik; P. Jacobs; P. G. Jones; K. Kadija; V. I. Kolesnikov; M. Kowalski; B. Lasiuk; Peter Lévai; K. Liebicher; U. Lynen; A. I. Malakhov; S. Margetis; C. Markert; C. Marks; B W Mayes; G. L. Melkumov; A. Mock; J. Molnár; J. M. Nelson; M. Oldenburg; Grazyna Janina Odyniec; G. Palla; A. D. Panagiotou; Yu N Pestov; A. Petridis; M. Pikna; W. Pimpl; L. Pinsky; A. Piper; R. J. Porter; A. M. Poskanzer; S. Poziombka; D. J. Prindle; F. Pühlhofer; W. Rauch; J. G. Reid; R E Renfordt; W. Retyk; H. G. Ritter; D. Röhrich; C. Roland; G. Roland; H. Rudolph; A. Rybicki; T. Sammer; A. Sandoval; H. Sann; E. Schäfer; R. Schmidt; D. Schmischke; N. Schmitz; S. Schönfelder; A. Yu. Semenov; J. Seyboth; P. Seyboth; J. Seyerlein; F. Sikler; B. Sitar; E. Skrzypczak; G. T. A. Squier; H. Stelzer; Reinhard Stock; P. Strmen; H. Ströbele; C. Struck; T. Susa; I. Szarka; I. Szentpetery; P. Szymanski; J. Sziklai; M. Toy; T. A. Trainor; S. Trentalange; T S Ullrich; Maria Vassiliou; G I Veres; G. Vesztergombi; D. Vranic; F. Q. Wang; D. D. Weerasundara; S. Wenig; C. Whitten; H H Wieman; T. Wienold; L. Wood; T. A. Yates; J. Zimanyi; X.-Z. Zhu; R. Zybert

    1999-01-01

    The NA49 detector is a wide acceptance spectrometer for the study of hadron production in p+p, p+A, and A+A collisions at the CERN SPS. The main components are 4 large-volume TPCs for tracking and particle identification via dE\\/dx. TOF scintillator arrays complement particle identification. Calorimeters for transverse energy determination and triggering, a detector for centrality selection in p+A collisions, and

  10. The Na + \\/I ? Symporter (NIS): Recent Advances

    Microsoft Academic Search

    Orlie Levy; Antonio De la Vieja; Nancy Carrasco

    1998-01-01

    The Na+\\/I- symporter (NIS) catalyzes the accumulation of iodide into thyroid cells, an essential step in the biosynthesis of thyroid hormones. As a result of the isolation of the rat NIS cDNA, steadfast advances in the study of NIS at the molecular level have resulted in the following accomplishments: generation of high-affinity anti-NIS antibodies, elucidation of NIS stoichiometry and specificity

  11. Advanced Intermediate-Temperature Na-S Battery

    SciTech Connect

    Lu, Xiaochuan; Kirby, Brent W.; Xu, Wu; Li, Guosheng; Kim, Jin Yong; Lemmon, John P.; Sprenkle, Vincent L.; Yang, Zhenguo (Gary) [Gary

    2013-01-01

    In this study, we reported an intermediate-temperature (~150°C) sodium-sulfur (Na-S) battery. With a reduced operating temperature, this novel battery can potentially reduce the cost and safety issues associated with the conventional high-temperature (300~350°C) Na-S battery. A dense ?"-Al2O3 solid membrane and tetraglyme were utilized as the electrolyte separator and catholyte solvent in this battery. Solubility tests indicated that cathode mixture of Na2S4 and S exhibited extremely high solubility in tetraglyme (e.g., > 4.1 M for Na2S4 + 4 S). CV scans of Na2S4 in tetraglyme revealed two pairs of redox couples with peaks at around 2.22 and 1.75 V, corresponding to the redox reactions of polysulfide species. The discharge/charge profiles of the Na-S battery showed a slope region and a plateau, indicating multiple steps and cell reactions. In-situ Raman measurements during battery operation suggested that polysulfide species were formed in the sequence of Na2S5 + S ? Na2S5 + Na2S4? Na2S4 + Na2S2 during discharge and in a reverse order during charge. This battery showed dramatic improvement in rate capacity and cycling stability over room-temperature Na-S batteries, which makes it attractive for renewable energy integration and other grid related applications.

  12. Influence of Salt Purity on Na+ and Palmitic Acid Interactions

    E-print Network

    Influence of Salt Purity on Na+ and Palmitic Acid Interactions Zishuai Huang, Wei Hua, Dominique of salt purity on the interactions between Na+ ions and the carboxylate (COO- ) head group of palmitic frequency generation (VSFG) spectroscopy. Ultrapure (UP) and ACS grade NaCl salts are used for aqueous

  13. Topical Review Voltage Dependence of the Na/K Pump

    E-print Network

    Gadsby, David

    Topical Review Voltage Dependence of the Na/K Pump R.F. Rakowski1 , D.C. Gadsby2 , P. De Weer3 1, Philadelphia, PA 19104, USA Received: 2 August 1996/Revised: 13 September 1996 Introduction Whether Na/K pump & Rakowski, 1988). While it follows from first principles that the rate of net forward Na/K pumping must

  14. Coupling mechanism of the oxaloacetate decarboxylase Na + pump

    Microsoft Academic Search

    Peter Dimroth; Petra Jockel; Markus Schmid

    2001-01-01

    The oxaloacetate decarboxylase Na+ pump consists of subunits ?, ? and ?, and contains biotin as the prosthetic group. The peripheral ? subunit catalyzes the carboxyltransfer from oxaloacetate to the prosthetic biotin group to yield the carboxybiotin enzyme. Subsequently, this is decarboxylated in a Na+-dependent reaction by the membrane-bound ? subunit. The decarboxylation is coupled to Na+ translocation from the

  15. Ouabain Assembles Signaling Cascades through the Caveolar Na /K -ATPase*

    E-print Network

    Abraham, Nader G.

    membrane fractions. Consis- tently, ouabain induced the formation of a Na /K - ATPase-Src-caveolin complex -cyclodextrin or caveo- lin-1 by siRNA significantly reduced the caveolar Na / K -ATPase and Src. Concomitantly, cholesterol deple- tion abolished ouabain-induced recruitment of Src to the Na /K -ATPase signaling complex

  16. Electrophysiological effects of basolateral [Na+] in Necturus gallbladder epithelium

    Microsoft Academic Search

    GUILLERMO A. ALTENBERG; JAMES S. STODDARD

    1992-01-01

    In Necturus gallbladder epithelium, lowering serosal (Na ÷) ((Na+)3 reversibly hyperpolarized the basolateral cell membrane voltage (Vc,) and reduced the fractional resistance of the apical membrane (fR~). Previous results have suggested that there is no sizable basolateral Na + conductance and that there are apical Ca~+-activated K ÷ channels. Here, we studied the mechanisms of the electro- physiological effects of

  17. RESOLUCI DEL PLA D'ESTABILITZACI DE PDI Acord nm.186/2011 del Consell de Govern pel qual s'aprova la resoluci del

    E-print Network

    Casanellas, Marta

    RESOLUCIÓ DEL PLA D'ESTABILITZACIÓ DE PDI Acord núm.186/2011 del Consell de Govern pel qual s'aprova la resolució del pla d'estabilització de PDI. · Document proposta informat favorablement per la PROGRAMA D'ESTABILITZACIÓ DEL PDI AMB CONTRACTE TEMPORAL A TEMPS COMPLET DE LA UPC Antecedents El Consell

  18. 1 nA Beam position monitor

    SciTech Connect

    Piller, M.; Flood, R.; Hammer, L.; Parks, M.; Strong, E.; Turlington, L.; Ursic, R. [Thomas Jefferson National Accelerator Facility (United States)

    1998-12-10

    A new BPM system, based on resonant cavities, has been developed for measuring the transverse position of very low-intensity electron beams delivered to Experimental Hall B at the Continuous Electron Beam Accelerator Facility (CEBAF) in Newport News. VA. The system requirements called for measuring down to 1 nA with a 100 m m resolution. The actual system is much better: it can measure down to 100 pA at the 100 m m required resolution. A 100 pA beam yields about 1 electron per bunch. Each 1 nA BPM utilizes three resonant RF cavities to determine the position of the beam: one cavity sensitive to X position, a second cavity sensitive to Y position, and a third cavity which measures intensity. The position cavities operate at room temperature in a dipole type mode at 1497 MHz and contain internal field perturbing rods in an arrangement similar to that of the CEBAF rf Separator cavities. The position cavities are electron beam welded assemblies made of copper plated stainless steel. The RF output signal from each cavity is processed using a down-converter and a DSP based commercial lock-in amplifier operating at 100 kHz. The lock-in amplifiers connect to the EPICS control system via an IEEE 488 bus. System features under development include intensity and position modulation measurement capabilities. This paper provides measured performance results and an updated overview of the installed and operational 1 nA BPM system.

  19. Homocoordination preference in NaCs and LiNa liquid alloys by first principles molecular dynamics

    NASA Astrophysics Data System (ADS)

    Costa Cabral, B. J.; Martins, J. L.

    1999-09-01

    We present structural and dynamics results based on Hellman-Feynman molecular dynamics for the liquid phase of the NaCs alloy at two Na concentrations (cNa=0.6 and 0.8) and for the Li0.61Na0.39 zero alloy at two temperatures (T=590 K and 690 K). For NaCs the calculated structure factor S(k) is in very good agreement with data from neutron scattering experiments and the partial structure factors are compared to semiexperimental, theoretical and classical molecular dynamics predictions. We predict similar values for the self-diffusion coefficients of Na and Cs atoms in the Na0.6Cs0.4 alloy. For LiNa the concentration-concentration structure factor is in good agreement with experimental data and our results for the dynamics are compared with data from classical molecular dynamics simulations.

  20. El teatro dominicano en la década del 80

    E-print Network

    Aybar, Robinson

    1992-04-01

    SPRING 1992 169 El teatro dominicano en la década del 80 Robinson Aybar En el año 1980 un grupo de teatristas reconocidos se reúne en la ciudad de Santiago de los Caballeros para discutir la problemática del teatro dominicano. De dicho... marzo como Día del Teatro en la República Dominicana. El CELCIT también lo había declarado día internacional del teatro. La década del 80 marca en la historia del teatro dominicano precedentes, ya que en 1983 se celebra el primer Festival de la...

  1. Development of illumination optics and projection optics for high-NA EUV exposure tool (HiNA)

    Microsoft Academic Search

    Tetsuya Oshino; Masayuki Shiraishi; Noriaki Kandaka; Katsumi Sugisaki; Hiroyuki Kondo; Kazuya Ota; K. Mashima; Katsuhiko Murakami; Hiroaki Oizumi; Iwao Nishiyama; Shinji Okazaki

    2003-01-01

    We have developed a high numerical aperture (NA) small-field exposure system (HiNA) for EUV exposure process development. NA of projection optics of EUV exposure tools for 45-nm node lithography is expected to be around 0.25, which is higher than that previously expected (0.1). HiNA has compatible illumination system, which can be switched to partial coherent illumination and coherent illumination by

  2. Growth mechanism of NaClO 3 and NaBrO 3 crystals from aqueous solutions

    Microsoft Academic Search

    V. Surender; N. Arundhathi; K. Kishan Rao

    2006-01-01

    A study of growth rates of NaClO3 and NaBrO3 has been carried out using a small growth cell by in situ observation. Normal growth rates of (100) faces of NaClO3 and (111) faces of NaBrO3 along ?110? direction are measured under relatively high supersaturation ranging from 3–8%. In the initial stages of growth,\\u000a (100), (110) and (111) faces develop in

  3. Comparative studies of etching mechanisms of CR-39 in NaOH/H2O and NaOH/ethanol

    E-print Network

    Yu, K.N.

    Comparative studies of etching mechanisms of CR-39 in NaOH/H2O and NaOH/ethanol K.C.C. Tse, D Avenue, Kowloon Tong, Hong Kong Available online 13 May 2007 Abstract The bulk etch rate for CR-39 in NaOH/ethanol accumulates on the surface of CR-39 detector during etching in NaOH/ethanol, which is absent during etching

  4. Analytical Potential Energy Surface for the Na + HF NaF + H reaction: Application of Conventional Transition-State Theory

    E-print Network

    Analytical Potential Energy Surface for the Na + HF NaF + H reaction: Application of Conventional Campos, SP, CEP 12247-970, Brazil In this work we present the kinetic properties of the title reaction and the best two Na + HF analytical Potential Energy Surfaces(PES) found in literature: Bond Order 5(BO5

  5. Na+ channel function, regulation, structure, trafficking and sequestration.

    PubMed

    Chen-Izu, Ye; Shaw, Robin M; Pitt, Geoffrey S; Yarov-Yarovoy, Vladimir; Sack, Jon T; Abriel, Hugues; Aldrich, Richard W; Belardinelli, Luiz; Cannell, Mark B; Catterall, William A; Chazin, Walter J; Chiamvimonvat, Nipavan; Deschenes, Isabelle; Grandi, Eleonora; Hund, Thomas J; Izu, Leighton T; Maier, Lars S; Maltsev, Victor A; Marionneau, Celine; Mohler, Peter J; Rajamani, Sridharan; Rasmusson, Randall L; Sobie, Eric A; Clancy, Colleen E; Bers, Donald M

    2015-03-15

    This paper is the second of a series of three reviews published in this issue resulting from the University of California Davis Cardiovascular Symposium 2014: Systems approach to understanding cardiac excitation-contraction coupling and arrhythmias: Na(+) channel and Na(+) transport. The goal of the symposium was to bring together experts in the field to discuss points of consensus and controversy on the topic of sodium in the heart. The present review focuses on Na(+) channel function and regulation, Na(+) channel structure and function, and Na(+) channel trafficking, sequestration and complexing. PMID:25772290

  6. Use of ²³Na-nuclear magnetic resonance to follow sodium uptake and efflux in NaCl-adapted and nonadapted millet (Panicum miliaceum) suspensions

    Microsoft Academic Search

    L. O. Sillerud; J. W. Heyser

    1984-01-01

    Cellular Na\\/sup +\\/ transport was followed in vivo by ²³Na nuclear magnetic resonance (NMR) using anionic dysprosium-based shift reagents to resolve internal and external ²³Na\\/sup +\\/ resonances. Proso millet (Panicum miliaceum) cell suspensions adapted for rapid growth on 130 mM NaCl had biphasic ²³Na efflux kinetics when shifted to low Na..mu.. medium, while nonadapted cells had little measurable Na\\/sup +\\/

  7. Na+-pyrophosphatase: a novel primary sodium pump.

    PubMed

    Malinen, Anssi M; Belogurov, Georgiy A; Baykov, Alexander A; Lahti, Reijo

    2007-07-31

    Membrane-bound pyrophosphatase (PPase) is commonly believed to couple pyrophosphate (PPi) hydrolysis to H+ transport across the membrane. Here, we demonstrate that two newly isolated bacterial membrane PPases from the mesophile Methanosarcina mazei (Mm-PPase) and the moderate thermophile Moorella thermoacetica and a previously described PPase from the hyperthermophilic bacterium Thermotoga maritima catalyze Na+ rather than H+ transport into Escherichia coli inner membrane vesicles (IMV). When assayed in uncoupled IMV, the three PPases exhibit an absolute requirement for Na+ but display the highest hydrolyzing activity in the presence of both Na+ and K+. Steady-state kinetic analysis of PPi hydrolysis by Mm-PPase revealed two Na+ binding sites. One of these sites can also bind K+, resulting in a 10-fold increase in the affinity of the other site for Na+ and a 2-fold increase in maximal velocity. PPi-driven 22Na+ transport into IMV containing Mm-PPase was unaffected by the protonophore carbonyl cyanide m-chlorophenylhydrazone, inhibited by the Na+ ionophore monensin, and activated by the K+ ionophore valinomycin. The Na+ transport was accompanied by the generation of a positive inside membrane potential as reported by Oxonol VI. These findings define Na+-dependent PPases as electrogenic Na+ pumps. Phylogenetic analysis suggests that ancient gene duplication preceded the split of Na+- and H+-PPases. PMID:17605473

  8. Erythrocyte Na+/K+ ATPase activity measured with sup 23 Na NMR

    SciTech Connect

    Ouwerkerk, R.; van Echteld, C.J.; Staal, G.E.; Rijksen, G. (University Hospital, Utrecht (Netherland))

    1989-11-01

    A {sup 23}Na NMR assay for measurement of erythrocyte Na+/K+ ATPase activity is presented. Using the nonpermeant shift reagent dysprosium tripolyphosphate the signals of intra- and extracellular sodium are separated, enabling measurement of sodium fluxes nondestructively, without the need to physically separate the cells from their environment. By increasing membrane permeability with nystatin we have shown that the assay allows the detection of differences in membrane permeability. With low doses of nystatin the ouabain-sensitive sodium flux increased more than twofold. With high doses of nystatin the Na+/K+ pump could not prevent an almost total equilibration of intra- and extracellular sodium. All sodium that entered the cells remained NMR visible, proving that sodium influx can be measured quantitatively. {sup 31}P NMR spectra taken before and after the assay revealed a slight acidification of the cells and no significant change in ATP concentration. No evidence of Dy3+ entering the cell was observed.

  9. René Marqués, del absurdo a la realidad

    E-print Network

    Zalacaí n, Daniel

    1978-10-01

    FALL 1978 33 René Marques, del absurdo a la realidad DANIEL ZALACAIN Es evidente en la obra de René Marqués la lucha del autor por tratar de vencer al tiempo, por recuperar un paraíso perdido, ultrajado por el presente. Como artista al fin... desentona con el presente—absurdo y sin sentido. El tiempo, por su parte, se muestra aplastante y devorador, pero no ha podido borrar por completo la existencia del pasado. Es bien palpable que el interior de las casas coloniales que él presenta...

  10. Standardization method of ²²Na using two NaI(Tl) scintillation detectors.

    PubMed

    Sato, Y; Yamada, T; Hasegawa, T

    2014-05-01

    A new standardization method for a sealed (22)Na point source was developed utilizing two NaI(Tl) scintillation detectors. In the proposed method, the count rates of annihilation radiation, gamma rays, their coincidence sum, and the coincidences between the two detectors are used. The equations from which the source activity can be deduced are derived in this work. A series of EGS-5 Monte Carlo calculations were conducted to test the validity of the expressions. The calculated activity agreed within approximately 1 percent with the literature data used as input in the simulations. PMID:24411317

  11. Photoionization of the alkali dimer cations Li+2, Na+2 and LiNa+

    NASA Astrophysics Data System (ADS)

    Dumitriu, Irina; Vanne, Yulian V.; Awasthi, Manohar; Saenz, Alejandro

    2007-05-01

    Photoionization cross sections for the three alkali dimer cations (Li+2, Na+2 and LiNa+) were calculated at the equilibrium internuclear distance for parallel, perpendicular and isotropic orientations of the molecular axis with respect to the field. A model-potential method was used for the description of the cores. The influence of the model-potential parameters on the photoionization spectra was investigated. Two different methods, a time-independent and a time-dependent one, were implemented and used for computing the cross sections.

  12. 1 nA Beam position monitor

    SciTech Connect

    Piller, M.; Flood, R.; Hammer, L.; Parks, M.; Strong, E.; Turlington, L.; Ursic, R. [Thomas Jefferson National Accelerator Facility (United States)

    1998-12-01

    A new BPM system, based on resonant cavities, has been developed for measuring the transverse position of very low-intensity electron beams delivered to Experimental Hall B at the Continuous Electron Beam Accelerator Facility (CEBAF) in Newport News. VA. The system requirements called for measuring down to 1 nA with a 100 m m resolution. The actual system is much better: it can measure down to 100 pA at the 100 m m required resolution. A 100 pA beam yields about 1 electron per bunch. Each 1 nA BPM utilizes three resonant RF cavities to determine the position of the beam: one cavity sensitive to X position, a second cavity sensitive to Y position, and a third cavity which measures intensity. The position cavities operate at room temperature in a dipole type mode at 1497 MHz and contain internal field perturbing rods in an arrangement similar to that of the CEBAF rf Separator cavities. The position cavities are electron beam welded assemblies made of copper plated stainless steel. The RF output signal from each cavity is processed using a down-converter and a DSP based commercial lock-in amplifier operating at 100 kHz. The lock-in amplifiers connect to the EPICS control system via an IEEE 488 bus. System features under development include intensity and position modulation measurement capabilities. This paper provides measured performance results and an updated overview of the installed and operational 1 nA BPM system. {copyright} {ital 1998 American Institute of Physics.}

  13. The Human Phospholamban Arg14-Deletion Mutant Localizes to Plasma Membrane and Interacts with the Na/K-ATPase

    PubMed Central

    Haghighi, Kobra; Pritchard, Tracy; Bossuyt, Julie; Waggoner, Jason R.; Yuan, Qunying; Fan, Guo-Chang; Osinska, Hanna; Anjak, Ahmad; Rubinstein, Jack; Robbins, Jeffrey; Bers, Donald M.; Kranias, Evangelia G.

    2012-01-01

    Depressed Ca-handling in cardiomyocytes is frequently attributed to impaired sarcoplasmic reticulum (SR) function in human and experimental heart failure. Phospholamban (PLN) is a key regulator of SR and cardiac function, and PLN mutations in humans have been associated with dilated cardiomyopathy (DCM). We previously reported the deletion of the highly conserved amino acid residue arginine 14 (nucleic acids 39, 40 and 41) in DCM patients. This basic amino acid is important in maintaining the upstream consensus sequence for PKA phosphorylation of Ser 16 in PLN. To assess the function of this mutant PLN, we introduced the PLN-R14Del in cardiac myocytes of the PLN null mouse. Transgenic lines expressing mutant PLN-R14Del at similar protein levels to wild types exhibited no inhibition of the initial rates of oxalate-facilitated SR Ca uptake compared to PLN-knockouts (PLN-KO). The contractile parameters and Ca-kinetics also remained highly stimulated in PLN-R14Del cardiomyocytes, similar to PLN-KO, and isoproterenol did not further stimulate these hyper-contractile basal parameters. Consistent with the lack of inhibition on SR Ca-transport and contractility, confocal microscopy indicated that the PLN-R14Del failed to co-localize with SERCA2a. Moreover, PLN-R14Del did not co-immunoprecipitate with SERCA2a (as did WT-PLN), but rather co-immunoprecipitated with the sarcolemmal Na/K-ATPase (NKA) and stimulated NKA activity. In addition, studies in HEK cells indicated significant fluorescence resonance energy transfer between PLN-R14Del-YFP and NKA?1-CFP, but not with the NKA regulator phospholemman. Despite the enhanced cardiac function in PLN-R14Del hearts (as in PLN-knockouts), there was cardiac hypertrophy (unlike PLN-KO) coupled with activation of Akt and the MAPK pathways. Thus, human PLN-R14Del is misrouted to the sarcolemma, in the absence of endogenous PLN, and alters NKA activity, leading to cardiac remodeling. PMID:22155237

  14. 23Na Nuclear Spin-Lattice Relaxation Studies of Na2Ni2TeO6

    NASA Astrophysics Data System (ADS)

    Itoh, Yutaka

    2015-06-01

    We report on 23Na NMR studies of the honeycomb lattice antiferromagnet Na2Ni2TeO6 by 23Na nuclear spin-echo techniques. The 23Na nuclear spin-lattice relaxation rate 1/23T1 exhibits critical divergence near the Néel temperature TN = 26 K, a narrow critical region, and the critical exponent w = 0.34 in 1/23T1 ? (T/TN - 1)-w for Na2Ni2TeO6, and TN = 18 K for Na2(Ni0.5Cu0.5)2TeO6. Although the uniform magnetic susceptibility of Na2Ni2TeO6 exhibits a broad maximum at 35 K, which is the characteristic of low-dimensional spin systems, the NMR results indicate a three-dimensional criticalphenomenon near the Néel temperature.

  15. Optimised NASICON ceramics for Na + sensing

    Microsoft Academic Search

    R. O. Fuentes; F. Figueiredo; F. M. B. Marques; J. I. Franco

    2002-01-01

    NASICON dense ceramics were obtained from solid state reaction between SiO2, Na3PO412H2O and two different types of zirconia: monoclinic ZrO2 and the yttria-doped tetragonal phase (ZrO2)0.97(Y2O3)0.03. Higher temperatures were needed to obtain dense samples of the yttrium free composition (1265 C). The electrical conductivity,\\u000a at room temperature, of the yttria-doped samples sintered at 1230 C (0.20 S\\/m) is significantly higher

  16. La guerra del fin del mundo: historia e invencion en una novela historica

    E-print Network

    Loeffler, Lisa Bowe

    1984-01-01

    41 67 78 IV CONCLUSION 98 APEND ICE NOTAS BIBLIOGRAFXA 104 131 135 VITA 138 CAPITULO I INTRODUCCION La novels mas reciente del escritor peruano contemporaneo Marin 1 Verges Llosa, La uerra del fin del mundo, trata un movimiento reli... novelists y corno critico (Oviedo, Invencion, 310). SegGn el, este terna le fascina porque lo 4 entiende menos cuanto mas lo practica. Puesto que los comentarios de Verges Llosa en sus obras de critics con respecto a otros novelistas se aplican...

  17. conomicas.a.esconomicasaes gua del estudiante

    E-print Network

    Escolano, Francisco

    Académico 2012/13 .......................................... 9 Plan de estudios del Grado en Economía el Plan de Estudios.................................................11 Vicedecanato de Prácticas puedes cambiar la contraseña. La contraseña es personal e intransferible. En caso de olvido

  18. CE Laboratory Del. University of Technology

    E-print Network

    Epema, Dick H.J.

    CE Laboratory Del. University of Technology 1 #12;Outline · The Staff reuse · Spinoff BlueBee 6 Electronic System Level Design (ESL) #12;CE research activities (2. => Technology scaling is posing new architectural, design, test, and computing challenges. 8 Dependable

  19. Minimizing Load Effects on NA4 Gear Vibration Diagnostic Parameter

    NASA Technical Reports Server (NTRS)

    Dempsey, Paula J.; Zakrajsek, James J.

    2001-01-01

    NA4 is a vibration diagnostic parameter, developed by researchers at NASA Glenn Research Center, for health monitoring of gears in helicopter transmissions. The NA4 reacts to the onset of gear pitting damage and continues to react to the damage as it spreads. This research also indicates NA4 reacts similarly to load variations. The sensitivity of NA4 to load changes will substantially affect its performance on a helicopter gearbox that experiences continuously changing load throughout its flight regimes. The parameter NA4 has been used to monitor gear fatigue tests at constant load. At constant load, NA4 effectively detects the onset of pitting damage and tracks damage severity. Previous research also shows that NA4 reacts to changes in load applied to the gears in the same way it reacts to the onset of pitting damage. The method used to calculate NA4 was modified to minimize these load effects. The modified NA4 parameter was applied to four sets of experimental data. Results indicate the modified NA4 is no longer sensitive to load changes, but remains sensitive to pitting damage.

  20. Apical Na+ permeability of frog skin during serosal Cl- replacement.

    PubMed

    Leibowich, S; DeLong, J; Civan, M M

    1988-05-01

    Gluconate substitution for serosal Cl- reduces the transepithelial short-circuit current (Isc) and depolarizes short-circuited frog skins. These effects could result either from inhibition of basolateral K+ conductance, or from two actions to inhibit both apical Na+ permeability (PapNa) and basolateral pump activity. We have addressed this question by studying whole-and split-thickness frog skins. Intracellular Na+ concentration (CcNa) and PapNa have been monitored by measuring the current-voltage relationship for apical Na+ entry. This analysis was conducted by applying trains of voltage pulses, with pulse durations of 16 to 32 msec. Estimates of PapNa and CcNa were not detectably dependent on pulse duration over the range 16 to 80 msec. Serosal Cl- replacement uniformly depolarized short-circuited tissues. The depolarization was associated with inhibition of Isc across each split skin, but only occasionally across the whole-thickness preparations. This difference may reflect the better ionic exchange between the bulk medium and the extracellular fluid in contact with the basolateral membranes, following removal of the underlying dermis in the split-skin preparations. PapNa was either unchanged or increased, and CcNa either unchanged or reduced after the anionic replacement. These data are incompatible with the concept that serosal Cl- replacement inhibits PapNa and Na,K-pump activity. Gluconate substitution likely reduces cell volume, triggering inhibition of the basolateral K+ channels, consistent with the data and conclusions of S.A. Lewis, A.G. Butt, M.J. Bowler, J.P. Leader and A.D.C. Macknight (J. Membrane Biol. 83:119-137, 1985) for toad bladder. The resulting depolarization reduces the electrical force favoring apical Na+ entry. The volume-conductance coupling serves to conserve volume by reducing K+ solute loss. Its molecular basis remains to be identified. PMID:2458472

  1. Departamento de Filosofa del Derecho y Derecho Internacional Privado Presentacin

    E-print Network

    Escolano, Francisco

    Departamento de Filosofía del Derecho y Derecho Internacional Privado Presentación El Departamento de Filosofía del Derecho y Derecho Internacional Privado está compuesto por las siguientes áreas de personalizada, los profesores del Departamento de Filosofía del Derecho y Derecho Internacional Privado ruegan

  2. RESOLUCI DE LA CONVOCATRIA DE LLICNCIES SABTIQUES DEL PDI

    E-print Network

    Politècnica de Catalunya, Universitat

    RESOLUCIÓ DE LA CONVOCATÒRIA DE LLICÈNCIES SABÀTIQUES DEL PDI CURS 2011-2012 Acord núm.110/2011 del Consell de Govern pel qual s'aprova la resolució de la convocatòria de llicències sabàtiques del PDI curs Acadèmic Juliol de 2011 RESOLUCIÓ DE LA CONVOCATÒRIA DE LLICÈNCIES SABÀTIQUES DEL PDI PER AL CURS 2011

  3. RESOLUCI DE LA CONVOCATRIA DE PERMISOS DE MOBILITAT DEL PDI

    E-print Network

    Politècnica de Catalunya, Universitat

    RESOLUCIÓ DE LA CONVOCATÒRIA DE PERMISOS DE MOBILITAT DEL PDI CURS 2011-2012 Acord núm.111/2011 del Consell de Govern pel qual s'aprova la resolució de la convocatòria de permisos de mobilitat del PDI curs Acadèmic Juliol de 2011 RESOLUCIÓ DE LA CONVOCATÒRIA DE PERMISOS DE MOBILITAT EXTERNA DEL PDI 2011

  4. Gonadal dysgenesis in del (18p) syndrome

    SciTech Connect

    Telvi, L.; Ion, A.; Fouquet, F. [Hospital Saint Vincent de Paul, Paris (France)] [and others

    1995-07-17

    We report on a girl with syndromal gonadal dysgenesis and a de novo del (18p). Genetic factors controlling gonadal development are located not only on the X chromosome, but also on autosomes. The present case suggests that one of these genes is situated on 18p. We conclude that patients with del (18p) syndrome should be evaluated for gonadal dysgenesis. 16 refs., 3 figs.

  5. Teatro uruguayo hacia el fin del siglo

    E-print Network

    Pignataro Calero, Jorge

    1993-10-01

    ciudad de Montevideo y, como tal, está sometido a las disposiciones presupuestarias de ingresos y gastos que para un período determinado de tiempo realizan las unidades económicas competentes. b. Nuevos grupos y salas. Sometida a análogas disposiciones... desaparecido Instituto Cultural Uruguayo- Soviético donde abrió sus puertas Arteatro; o el garaje del Instituto Cultural Anglo-Uruguayo convertido en la Sala III de dicha institución. Una de las figuras más prestigiosas y de proyección internacional del medio...

  6. Modificacin de Ttulo de Master en Urbanismo: Planes y proyectos. Del territorio a la ciudad 1. Descripcin del ttulo

    E-print Network

    Fraguela, Basilio B.

    .2. Procedimiento de adaptación, en su caso, de los estudiantes de los estudios existentes al nuevo plan de estudios elaboración del plan de estudio 1 #12;Modificación de Título de Master en Urbanismo: Planes y proyectos. Del general del plan de estudios 5.2. Estructura del plan de estudios 5.3. Descripción detallada de los

  7. Modificacin de Ttulo de Master Universitario en Arquitectura del Paisaje Juana de Vega 1. Descripcin del ttulo

    E-print Network

    Fraguela, Basilio B.

    .2. Procedimiento de adaptación, en su caso, de los estudiantes de los estudios existentes al nuevo plan de estudios elaboración del plan de estudio 1 #12;Modificación de Título de Master Universitario en Arquitectura del general del plan de estudios 5.2. Estructura del plan de estudios 5.3. Descripción detallada de los

  8. Na?La?(CO?)? and CsNa?Ca?(CO?)?: two new carbonates as UV nonlinear optical materials.

    PubMed

    Luo, Min; Wang, GenXiang; Lin, Chensheng; Ye, Ning; Zhou, Yuqiao; Cheng, Wendan

    2014-08-01

    Two nonlinear optical crystal carbonates (Na4La2(CO3)5 and CsNa5Ca5(CO3)8 were successfully synthesized by hydrothermal method, and both of them crystallized in the same noncentrosymmetric hexagonal space group P63mc (No. 186). The structure of Na4La2(CO3)5 consists of a three-dimensional network made up of [CO3] triangles as well as irregular [Na(0.67)La(0.33)O10] and [NaO8] polyhedra. The structure of CsNa5Ca5(CO3)8 can be described as the standing-on-edge [CO3] groups connect the adjacent infinite [CaCO3]? layers in the ab plane to construct a framework with four types of channels running parallel to [010]. The Na, Cs, and [Na(0.67)Ca(0.33)] atoms reside in these channels. The measurement of second harmonic generation (SHG) by the method adapted from Kurtz and Perry indicated that Na4La2(CO3)5 and CsNa5Ca5(CO3)8 were phase-matchable in the visible region and exhibited SHG responses of approximately 3 and 1 × KH2PO4 (KDP). Meanwhile, they exhibited wide transparent region with short UV cutoff edge at about 235 and 210 nm, respectively, suggesting that these crystals as NLO materials may have potential applications in the UV region. PMID:25027762

  9. Na+/H+ and Na+/NH4+ exchange activities of zebrafish NHE3b expressed in Xenopus oocytes

    PubMed Central

    Ito, Yusuke; Kato, Akira; Hirata, Taku; Hirose, Shigehisa

    2014-01-01

    Zebrafish Na+/H+ exchanger 3b (zNHE3b) is highly expressed in the apical membrane of ionocytes where Na+ is absorbed from ion-poor fresh water against a concentration gradient. Much in vivo data indicated that zNHE3b is involved in Na+ absorption but not leakage. However, zNHE3b-mediated Na+ absorption has not been thermodynamically explained, and zNHE3b activity has not been measured. To address this issue, we overexpressed zNHE3b in Xenopus oocytes and characterized its activity by electrophysiology. Exposure of zNHE3b oocytes to Na+-free media resulted in significant decrease in intracellular pH (pHi) and intracellular Na+ activity (aNai). aNai increased significantly when the cytoplasm was acidified by media containing CO2-HCO3? or butyrate. Activity of zNHE3b was inhibited by amiloride or 5-ethylisopropyl amiloride (EIPA). Although the activity was accompanied by a large hyperpolarization of ?50 mV, voltage-clamp experiments showed that Na+/H+ exchange activity of zNHE3b is electroneutral. Exposure of zNHE3b oocytes to medium containing NH3/NH4+ resulted in significant decreases in pHi and aNai and significant increase in intracellular NH4+ activity, indicating that zNHE3b mediates the Na+/NH4+ exchange. In low-Na+ (0.5 mM) media, zNHE3b oocytes maintained aNai of 1.3 mM, and Na+-influx was observed when pHi was decreased by media containing CO2-HCO3? or butyrate. These results provide thermodynamic evidence that zNHE3b mediates Na+ absorption from ion-poor fresh water by its Na+/H+ and Na+/NH4+ exchange activities. PMID:24401990

  10. A primary respiratory Na+ pump of an anaerobic bacterium: the Na+-dependent NADH:quinone oxidoreductase of Klebsiella pneumoniae.

    PubMed

    Dimroth, P; Thomer, A

    1989-01-01

    Membranes of Klebsiella pneumoniae, grown anaerobically on citrate, contain a NADH oxidase activity that is activated specifically by Na+ or Li+ ions and effectively inhibited by 2-heptyl-4-hydroxyquinoline-N-oxide (HQNO). Cytochromes b and d were present in the membranes, and the steady state reduction level of cytochrome b increased on NaCl addition. Inverted bacterial membrane vesicles accumulated Na+ ions upon NADH oxidation. Na+ uptake was completely inhibited by monensin and by HQNO and slightly stimulated by carbonylcyanide-p-trifluoromethoxy phenylhydrazone (FCCP), thus indicating the operation of a primary Na+ pump. A Triton extract of the bacterial membranes did not catalyze NADH oxidation by O2, but by ferricyanide or menadione in a Na+-independent manner. The Na+-dependent NADH oxidation by O2 was restored by adding ubiquinone-1 in micromolar concentrations. After inhibition of the terminal oxidase with KCN, ubiquinol was formed from ubiquinone-1 and NADH. The reaction was stimulated about 6-fold by 10 mM NaCl and was severely inhibited by low amounts of HQNO. Superoxide radicals were formed during electron transfer from NADH to ubiquinone-1. These radicals disappeared by adding NaCl, but not with NaCl and HQNO. It is suggested that the superoxide radicals arise from semiquinone radicals which are formed by one electron reduction of quinone in a Na+-independent reaction sequence and then dismutase in a Na+ and HQNO sensitive reaction to quinone and quinol. The mechanism of the respiratory Na+ pump of K. pneumoniae appears to be quite similar to that of Vibrio alginolyticus. PMID:2545175

  11. Na + -fast ionic conducting glass-ceramics of silicophosphates

    Microsoft Academic Search

    Toshinori Okura; Hideki Monma; Kimihiro Yamashita

    2010-01-01

    The Na+-fast ionic conducting glass-ceramics with Na5YSi4O12 (N5)-type structure were successfully synthesized using the composition formula of Na3+3x-y\\u000a R1-x\\u000a P\\u000a y\\u000a Si3-y\\u000a O9 for a variety of rare earth ions, R, under the appropriate composition parameters. In the crystallization of N5-type glass-ceramics, its relatives (Na3YSi3O9 (N3)- and Na9YSi6O18 (N9)-type glass-ceramics) structurally belonging to the family of Na24?3x\\u000a Y\\u000a x\\u000a Si12O36

  12. Dissolution and Recrystallization of GaN in Molten Na

    NASA Astrophysics Data System (ADS)

    Aoki, Masato; Yamane, Hisanori; Shimada, Masahiko; Sarayama, Seiji; Iwata, Hirokazu; Disalvo, Francis J.

    2003-12-01

    The dissolution mass of GaN in molten Na at 650-800°C and 3-5 MPa of N2 was determined by weight loss of polycrystalline GaN fragments immersed in Na and by chemical analysis of the amount of Ga dissolved in Na. The dissolution of GaN in Na was equilibrated within 100 h and the dissolution mass increased with increasing temperature but decreased with increasing N2 pressure. It was found that the addition of a small amount of Li3N into the Na melt increased the dissolution mass of GaN. Transparent platelet single crystals of GaN with sizes over 300 ?m were grown from nutrient GaN powder by cooling a Na solution with a Li3N additives from 800°C to 700°C at 1°C/h.

  13. Pyrophosphate-Fueled Na+ and H+ Transport in Prokaryotes

    PubMed Central

    Malinen, Anssi M.; Luoto, Heidi H.

    2013-01-01

    SUMMARY In its early history, life appeared to depend on pyrophosphate rather than ATP as the source of energy. Ancient membrane pyrophosphatases that couple pyrophosphate hydrolysis to active H+ transport across biological membranes (H+-pyrophosphatases) have long been known in prokaryotes, plants, and protists. Recent studies have identified two evolutionarily related and widespread prokaryotic relics that can pump Na+ (Na+-pyrophosphatase) or both Na+ and H+ (Na+,H+-pyrophosphatase). Both these transporters require Na+ for pyrophosphate hydrolysis and are further activated by K+. The determination of the three-dimensional structures of H+- and Na+-pyrophosphatases has been another recent breakthrough in the studies of these cation pumps. Structural and functional studies have highlighted the major determinants of the cation specificities of membrane pyrophosphatases and their potential use in constructing transgenic stress-resistant organisms. PMID:23699258

  14. Mechanism of inhibition of alanine absorption by Na ricinoleate.

    PubMed

    Hajjar, J J; Murphy, D M; Scheig, R L

    1979-05-01

    The mechanism of inhibition of alanine absorption by Na ricinoleate has been examined in the rabbit intestine. This fatty acid in a concentration of 2--5 mM inhibits alanine absorption in vivo and in vitro. The inhibition is more evident in the jejunum than in the ileum. Strips of ileal mucosa treated with Na ricinoleate gain Na. Sodium ricinoleate inhibits alanine influx across rabbit ileum, even in the presence of a sodium gradient across these cells. The results suggest that the main action of Na ricinoleate is on the alanine-transport system at the brush-border membrane. The fatty acid may also inhibit amino acid absorption by increasing intestinal cell Na concentration, which results in a decreased Na gradient across the brush-border membrane. PMID:443374

  15. Multielectron removal processes in He{sup 2+}+Na collisions

    SciTech Connect

    Knoop, S.; Hasan, V. G.; Morgenstern, R.; Hoekstra, R. [KVI, Atomic Physics, Rijksuniversiteit Groningen, Zernikelaan 25, NL-9747 AA, Groningen (Netherlands)

    2006-06-15

    Multielectron processes have been studied by measuring the Na{sup 2+} and Na{sup 3+} recoil momenta resulting from 10 keV/amu He{sup 2+}+Na(3s) collisions. The Na{sup 2+} Q-value spectrum shows that transfer ionization dominates two-electron removal. Double capture populates mostly singly excited He(1snl) states. A smaller fraction of double capture leads to doubly excited He. Na{sup 3+} recoil ions are created by double capture into the He ground state and the emission of a third electron into the continuum. The Na{sup 3+} recoil ion is not left in its triplet ground state but in one of the low-lying excited singlet terms due to spin conservation.

  16. Magnesium correction to the NaKCa chemical geothermometer

    USGS Publications Warehouse

    Fournier, R.O.; Potter, R.W., II

    1979-01-01

    Equations and graphs have been devised to correct for the adverse effects of magnesium upon the Na-K-Ca chemical geothermometer. Either the equations or graphs can be used to determine appropriate temperature corrections for given waters with calculated NaKCa temperatures > 70??C and R 50 are probably derived from relatively cool aquifers with temperatures approximately equal to the measured spring temperature, irrespective of much higher calculated Na-K-Ca temperatures. ?? 1979.

  17. Simulation of Na D emission near Europa during eclipse

    USGS Publications Warehouse

    Cassidy, T.A.; Johnson, R.E.; Geissler, P.E.; Leblanc, F.

    2008-01-01

    The Cassini imaging science subsystem observed Europa in eclipse during Cassini's Jupiter flyby. The disk-resolved observations revealed a spatially nonuniform emission in the wavelength range of 200-1050 nm (clear filters). By building on observations and simulations of Europa's Na atmosphere and torus we find that electron-excited Na in Europa's tenuous atmosphere can account for the observed emission if the Na is ejected preferentially from Europa's dark terrain. Copyright 2008 by the American Geophysical Union.

  18. Aggregate centres of Ag - ions in KCl : Na crystals

    NASA Astrophysics Data System (ADS)

    Tsuboi, T.; Zota, S.; Topa, V.

    2001-01-01

    Not only (Ag -) 2 and Ag -(Na +) centres but also various Ag --Na + aggregate centres have been produced in Ag +-, Na +- and Ca 2+-codoped KCl crystals by unusual electrolytic colouration such as colouration at a relatively low temperature of 280°C and a high electric field of 5000 V/cm. Absorption and magnetic circular dichroism spectra due to these centres have been investigated.

  19. Molecular genetics of the human Na + \\/glucose cotransporter

    Microsoft Academic Search

    M. A. Hediger; E. Turk; A. M. Pajor; E. M. Wright

    1989-01-01

    Summary Recent success in expression cloning has revealed the primary structure of the Na+\\/glucose cotransporter from rabbit small intestine, and this has subsequently led to the cloning of the Na+\\/glucose cotransporters from human small intestine and human kidney. Close homology is evident between the rabbit and human intestinal Na+\\/glucose cotransporters at the DNA level, and the predicted amino acid and

  20. Use of /sup 23/Na-nuclear magnetic resonance to follow sodium uptake and efflux in NaCl-adapted and nonadapted millet (Panicum miliaceum) suspensions

    SciTech Connect

    Sillerud, L.O.; Heyser, J.W.

    1984-05-01

    Cellular Na/sup +/ transport was followed in vivo by /sup 23/Na nuclear magnetic resonance (NMR) using anionic dysprosium-based shift reagents to resolve internal and external /sup 23/Na/sup +/ resonances. Proso millet (Panicum miliaceum) cell suspensions adapted for rapid growth on 130 mM NaCl had biphasic /sup 23/Na efflux kinetics when shifted to low Na..mu.. medium, while nonadapted cells had little measurable Na/sup +/ efflux after preloading with /sup 23/NaCl. Uptake of /sup 23/Na was also observed using /sup 23/Na NMR. The resonance frequency of the external Na/sup +/-dysprosium (III) triphosphate, relative to that of the /sup 23/Na in the cells, was sensitive to pH, permitting the pH of the external medium to be followed during the course of in vivo experiments. 20 references, 3 figures.

  1. Use of Na-Nuclear Magnetic Resonance To Follow Sodium Uptake and Efflux in NaCl-Adapted and Nonadapted Millet (Panicum miliaceum) Suspensions.

    PubMed

    Sillerud, L O; Heyser, J W

    1984-05-01

    Cellular Na(+) transport was followed in vivo by (23)Na nuclear magnetic resonance (NMR) using anionic dysprosium-based shift reagents to resolve internal and external (23)Na(+) resonances. Proso millet (Panicum miliaceum) cell suspensions adapted for rapid growth on 130 mm NaCl had biphasic (23)Na efflux kinetics when shifted to low Na(+) medium, while nonadapted cells had little measurable Na(+) efflux after preloading with (23)NaCl. Uptake of (23)Na was also observed using (23)Na NMR. The resonance frequency of the external Na(+)-dysprosium (III) triphosphate, relative to that of the (23)Na in the cells, was sensitive to pH, permitting the pH of the external medium to be followed during the course of in vivo experiments. PMID:16663592

  2. Effects of Cl adatom on Na-Decorated graphene

    NASA Astrophysics Data System (ADS)

    Song, Xinxiang; Sun, Yu; Dong, Meifeng; Li, Chun; Wang, Jiesheng; Mimura, Hidenori; Yuan, Guang

    2015-06-01

    The effects of the Cl adatom on Na-decorated graphene are studied using first principles density functional theory under the generalized gradient approximation to calculate the adsorption energy, geometric structure, charge density difference, and density of states. When Na and Cl adatoms are simultaneously absorbed on opposite sides of graphene, the adsorption energy of Na increases by about 1?eV and the adsorption system becomes more stable because graphene can effectively transfer the 3s valence of the Na adatom to the Cl adatom.

  3. First-principles calculations study of Na adsorbed on silicene

    NASA Astrophysics Data System (ADS)

    Guo, Xi-Xi; Guo, Ping; Zheng, Ji-Ming; Cao, Li-Ke; Zhao, Pu-Ju

    2015-06-01

    Geometry, electronic structure, and diffusion properties of Na atom on the pristine and single vacancy-defected silicene sheet have been systematically investigated by using density functional theory with generalized gradient approximation. The most stable positions of Na atom on the perfect and the defected silicene sheet are determined, and four diffusion paths have been explored. The minimum diffusion barrier of Na atom is 0.25 eV on pristine silicene, and 1.44 eV on single vacancy-defected silicene sheet. The vacancy exhibits a more significant influence than the adsorption of the Na atom on the electronic structure of silicene.

  4. Atomic motions in an unusual molecular semiconductor: NaSn

    NASA Astrophysics Data System (ADS)

    Stoddard, Ronald Dean; Conradi, Mark S.; McDowell, A. F.; Saboungi, Marie-Louise; Price, David Long

    1995-11-01

    Recent investigations of the compound NaSn (1:1) have indicated that both fast conduction of Na+ cations and rapid reorientations of (Sn4)4- anions are present in the high-temperature solid phase, ?-NaSn. We have used 23Na and 119Sn nuclear magnetic resonance to separately monitor the motions of Na and Sn in the low-temperature ordered solid phase, ?-NaSn, where the correlation times of the motions are much longer. The Na+ motions are evident in T1, T1?, T2, and T*2 (linewidth) 23Na data at magnetic fields of 8.0 and 2.0 T. The Na motions are described by a single time constant with thermal activation parameters Ea/kB=9700 K and ?D(?)=1.7×1014 s-1. Sn motions are evident in T2, line shape, and stimulated echo data taken at 8.0 T. 119Sn stimulated echo data unequivocally show the Sn motion to be reorientations of Sn4 tetrahedra; any diffusion of Sn between tetrahedra is much slower. The combined T2 and stimulated echo data for 119Sn demonstrate that the Sn4 reorientations are thermally activated with Ea/kB=13 800 K and ?R(?)=2.3×1015 s-1. The temperature dependence of the 119Sn T1 fits an activation energy of 7000 K; the Sn T1 is believed to be due to thermally activated charge carriers.

  5. Study of OSL in NaF: Ca,Cu

    NASA Astrophysics Data System (ADS)

    More, Y. K.; Wankhede, S. P.; Moharil, S. V.

    2013-06-01

    Sodium Fluoride containing Cu+ ions was prepared by R.A.P. followed by melt-quenching technique. Results on photo, thermo and optically stimulated luminescence in NaF:Ca,Cu are reported. OSL sensitivity of NaF:Ca,Cu is approximately 2 times than that of standard phosphor LMP. The rate of OSL depletion for 90% decay for NaF:Ca,Cu is 0.3 times as that of OSL phosphor LMP. NaF:Ca,Cu thus deserves much more attention than it has received up till now.

  6. Estado del desarrollo del control para la gestin de las funciones de tiempo en

    E-print Network

    Politècnica de Catalunya, Universitat

    Estado del desarrollo del control para la gestión de las funciones de tiempo en Visual TRANSIN necesitamos para VT? -.Discretizar temporalmente (tiempos de control). -.Operar con funciones. -.Encontrar. -.Automático. ·Otros parámetros: -.Número de problema. -.Régimen. -.Intervalos. #12;Funciones de Tiempo ·Origen

  7. De los hacendados a los forestales: Manejo del espacio, dominacidn y explotacidn del bosque

    E-print Network

    Paris-Sud XI, Université de

    uno más entre los numerosos medios de control que supieron y saben usar los dominantes en el medio autonomía, a través del control de los circuitos de créditos, de asesoría técnica, de "programas de el Estado, bajo el impulso del gobernador A. Tejeda. Por otro lado, en cuanto a la propiedad privada

  8. CONVOCATRIA DEL PREMI DE FOMENT DEL MULTILINGISME CURS ACADMIC 2011/2012

    E-print Network

    Geffner, Hector

    Premi de Foment del Multilingüisme (PFM) per al curs 2011-2012, adreçat a estudiants de qualsevol ensenyament de grau de la UPF. El PFM consisteix en un curs de llengua, gratuït, anual o semestral, en Referència per a les llengües (MECR) del Consell d'Europa. El PFM s'ha de fer efectiu amb una matrícula al

  9. CONVOCATRIA DEL PREMI DE FOMENT DEL MULTILINGISME CURS ACADMIC 2010/2011

    E-print Network

    Geffner, Hector

    Premi de Foment del Multilingüisme (PFM) per al curs 2010-2011, adreçat a estudiants de qualsevol ensenyament de grau de la UPF. El PFM consisteix en un curs de llengua, gratuït, d'un nivell, en qualsevol Comú Europeu de Referència per a les llengües (MCER) del Consell d'Europa. El PFM s'ha de fer efectiu

  10. Il Marocco nello scenario agro-alimentare del Bacino del Mediterraneo

    Microsoft Academic Search

    Paolo Cupo

    2000-01-01

    Il Marocco nello scenario agro-alimentare del Bacino del Mediterraneo (di Paolo Cupo) - ABSTRACT: The economy of Morocco is heaving depending on agriculture and, hence, its performance is strongly relating to the exogenous factors such as the weather conditions. For this reason a structural change of the economy should be necessary which, by inducing a shifting of workers among the

  11. Aprendizajes del Informe Especial (SREX) del IPCC Desastres en Amrica Latina y el Caribe

    E-print Network

    sus implicaciones para la sociedad y el desarrollo sostenible. El informe considera los efectos del referencia a este documento se debe hacer de la siguiente manera: Alianza Clima y Desarrollo (2012) La adaptación (véase la Figura 1). El informe considera el rol del desarrollo en fomentar la exposición y la

  12. Los orígenes del Partido del Socialismo Democrático (1989-1993): el ave fénix roja en Alemania

    Microsoft Academic Search

    Ricardo Martín de la Guardia

    2005-01-01

    El Partido del Socialismo Democrático (Partei des Demokratischen Sozialismus), surgido de la descomposición interna del SED (Sozialistiscbe Einbeitspartei Deutschlands), es un caso relevante de adaptación de los partidos únicos en los regímenes comunistas a la democracia plurípar-tidista. Dadas las peculiaridades de la transición en la República Democrática de Alemania, acelerada por su rápida integración en la República Federal, el SED

  13. INTRODUCCI Aquest Pla Estratgic dels Serveis Tcnics d'Investigaci forma part del Pla

    E-print Network

    Escolano, Francisco

    INTRODUCCIÓ Aquest Pla Estratègic dels Serveis Tècnics d'Investigació forma part del Pla Estratègic Sectorial de Gerència, que en el seu moment s'integrarà en el Pla Estratègic General de la Universitat d en procés constant de creixement és de vital importància disposar d'un Pla Estratègic Propi que li

  14. Preguntas y respuestas acerca del Estudio del Tamoxifeno y Raloxifeno (STAR)

    Cancer.gov

    El Estudio del Tamoxifeno y Raloxifeno (STAR, por sus siglas en inglés) es un estudio clínico (un estudio de i nvestigación conducido con voluntarios) diseñado para ver cómo el medicamento raloxifeno (Evista) se compara con el medicamento tamoxifeno (Nolvadex) en reducir la incidencia de cáncer del seno en las mujeres con alto riesgo de desarrollar la enfermedad.

  15. Pion and kaon freezeout in NA44

    SciTech Connect

    NA44 Collaboration

    1994-12-01

    The NA44 spectrometer is optimized for the study of single and two-particle particle spectra near mid-rapidity for transverse momenta below {approx} 1 GeV/c. A large fraction of all pairs in the spectrometer`s acceptance are at low relative momenta, resulting in small statistical uncertainties on the extracted size parameters. In addition, the spectrometer`s clean particle identification allows the authors to measure correlation functions for pions, kaons, and protons. This contribution will concentrate on the source size parameters determined from pion and kaon correlation functions. These size parameters will be compared to calculations from the RQMD event generator and also interpreted in the context of a hydrodynamic model. Finally, the measured single particle spectra will be examined from the viewpoint of hydrodynamics.

  16. New results from the NA57 experiment

    E-print Network

    G. E. Bruno; for the NA57 Collaboration

    2004-04-05

    The production of hyperons in Pb-Pb and p-Be interaction at 40 A GeV/c beam momentum has been measured by the NA57 experiment. Strange particle enhancements at 40 A GeV/c are presented for the first time and compared to those measured at 158 A GeV/c. The transverse mass spectra of high statistics, high purity samples of K0_short, Lambda, Xi and Omega particles produced in Pb-Pb collisions at 158 A GeV/c have been studied in the framework of the blast-wave model. The dependence of the freeze-out parameters on particle species and event centrality is discussed.

  17. The NA49 large acceptance hadron detector

    E-print Network

    Afanasiev, S V; Appelshäuser, H; Bächler, J; Barna, D; Barnby, L S; Bartke, Jerzy; Barton, R A; Betev, L; Bialkowska, H; Bieser, F; Billmeier, A; Blyth, C O; Böck, R K; Bormann, C; Bracinik, J; Brady, F P; Brockmann, R; Brun, R; Buncic, P; Caines, H L; Cebra, D; Cooper, G E; Cramer, J G; Csató, P; Cyprian, M; Dunn, J; Eckardt, V; Eckhardt, F; Empl, T; Eschke, J; Ferguson, M I; Fessler, H; Fischer, H G; Flierl, D; Fodor, Z; Frankenfeld, Ulrich; Foka, P Y; Freund, P; Friese, V; Ftácnik, J; Fuchs, M; Gabler, F; Gál, J; Ganz, R E; Gazdzicki, M; Gladysz-Dziadus, E; Grebieszkow, J; Günther, J; Harris, J W; Hegyi, S; Henkel, T; Hill, L A; Hlinka, V; Huang, I; Hümmler, H; Igo, G; Irmscher, D; Ivanov, M; Janik, R; Jacobs, P; Jones, P G; Kadija, K; Kolesnikov, V I; Kowalski, M; Lasiuk, B; Lévai, Peter; Liebicher, K; Lynen, U; Malakhov, A I; Margetis, S; Markert, C; Marks, C; Mayes, B W; Melkumov, G L; Mock, A; Molnár, J; Nelson, J M; Oldenburg, M; Odyniec, Grazyna Janina; Pálla, G; Panagiotou, A D; Pestov, Yu N; Petridis, A; Pikna, M; Pimpl, W; Pinsky, L; Piper, A; Porter, R J; Poskanzer, A M; Poziombka, S; Prindle, D J; Pühlhofer, F; Rauch, W; Reid, J G; Renfordt, R E; Retyk, W; Ritter, H G; Röhrich, D; Roland, C; Roland, G; Rudolph, H; Rybicki, A; Sammer, T; Sandoval, A; Sann, H; Schäfer, E; Schmidt, R; Schmischke, D; Schmitz, N; Schönfelder, S; Semenov, A Yu; Seyboth, J; Seyboth, P; Seyerlein, J; Siklér, F; Sitár, B; Skrzypczak, E; Squier, G T A; Stelzer, H; Stock, Reinhard; Strmen, P; Ströbele, H; Struck, C; Susa, T; Szarka, I; Szentpétery, I; Szymanski, P; Sziklai, J; Toy, M; Trainor, T A; Trentalange, S; Ullrich, T S; Vassiliou, Maria; Veres, G I; Vesztergombi, G; Vranic, D; Wang, F; Weerasundara, D D; Wenig, S; Whitten, C; Wieman, H H; Wienold, T; Wood, L; Yates, T A; Zimányi, J; Zhu, X Z; Zybert, R

    1999-01-01

    The NA49 detector is a wide acceptance spectrometer for the study of hadron production in p+p, p+A, and A+A collisions at the CERN SPS. The main components are 4 large volume TPCs for tracking and particle identification via $dE/dx$. TOF scintillator arrays complement particle identification. Calorimeters for transverse energy determination and triggering, a detector for centrality selection in p+A collisions, and beam definition detectors complete the set-up. A description of all detector components is given with emphasis on new technical realizations. Performance and operational experience are discussed in particular with respect to the high track density environment of central Pb+Pb collisions.

  18. Mercury's Na Exosphere from MESSENGER data

    NASA Astrophysics Data System (ADS)

    Killen, Rosemary M.; Burger, M. H.; Cassidy, T. A.; Sarantos, M.; Vervack, R. J.; McClintock, W. E.; Merkel, A. W.; Sprague, A. L.; Solomon, S. C.

    2012-10-01

    MESSENGER entered orbit about Mercury on March 18, 2011. Since then, the Ultraviolet and Visible Spectrometer (UVVS) channel of MESSENGER's Mercury Atmospheric and Surface Composition Spectrometer (MASCS) has been observing Mercury's exosphere nearly continuously. Daily measurements of Na brightness were fitted with non-uniform exospheric models. With Monte Carlo sampling we traced the trajectories of a representative number of test particles, generally one million per run per source process, until photoionization, escape from the gravitational well, or permanent sticking at the surface removed the atom from the simulation. Atoms were assumed to partially thermally accommodate on each encounter with the surface with accommodation coefficient 0.25. Runs for different assumed source processes are run separately, scaled and co-added. Once these model results were saved onto a 3D grid, we ran lines of sight from the MESSENGER spacecraft to infinity using the SPICE kernels and we computed brightness integrals. Note that only particles that contribute to the measurement can be constrained with our method. Atoms and molecules produced on the nightside must escape the shadow in order to scatter light if the excitation process is resonant-light scattering, as assumed here. The aggregate distribution of Na atoms fits a 1200 K gas, with a PSD distribution, along with a hotter component. Our models constrain the hot component, assumed to be impact vaporization, to be emitted with a 2500 K Maxwellian. Most orbits show a dawnside enhancement in the hot component broadly spread over the leading hemisphere. However, on some dates there is no dawn/dusk asymmetry. The hot portion of the source appears to be highly variable. The authors acknowledge support from NASA through the MESSENGER Participating Scientist Program and Planetary Atmospheres research grants.

  19. Dependence of thermoluminescence in LiF:Mg,Cu,Na,Si phosphor on Na dopant concentration and thermal treatment

    Microsoft Academic Search

    Kaiyong Tang

    2003-01-01

    A new phosphor, LiF:Mg,Cu,Na,Si, has been developed in this laboratory for thermoluminescence. The thermoluminescence dependence on the concentration of Na dopant between 0 mol% and 0.45 mol% and thermal treatment between 240°C and 310°C was investigated. With an increase of Na concentration, the TL sensitivity and the main peak increase when the annealing temperature is less than 300°C. With an

  20. A primary respiratory Na + pump of an anaerobic bacterium: the Na + -dependent NADH:quinone oxidoreductase of Klebsiella pneumoniae

    Microsoft Academic Search

    Peter Dimroth; Anna Thomer

    1989-01-01

    Membranes of Klebsiella pneumoniae, grown anaerobically on citrate, contain a NADH oxidase activity that is activated specifically by Na+ or Li+ ions and effectively inhibited by 2-heptyl-4-hydroxyquinoline-N-oxide (HQNO). Cytochromes b and d were present in the membranes,\\u000a and the steady state reduction level of cytochrome b increased on NaCl addition. Inverted bacterial membrane vesicles accumulated\\u000a Na+ ions upon NADH oxidation.

  1. Microhardness studies on as-grown faces of NaClO 3 and NaBrO 3 crystals

    Microsoft Academic Search

    K. Kishan Rao; V. Surender; B. Saritha Rani

    2002-01-01

    Single crystals of NaClO3 and NaBrO3 are grown from their aqueous solutions at a constant temperature of 35°C by slow evaporation by using good quality seed crystals.\\u000a Systematic microhardness studies are made on as-grown faces of these crystals at various loads. Typical cracks are observed\\u000a at the corners of the impressions in NaClO3 whereas in addition to the cracks at

  2. The effect of NaCl/g/ on the Na2SO4-induced hot corrosion of NiAl

    NASA Technical Reports Server (NTRS)

    Smeggil, J. G.; Bornstein, N. S.; Decrescente, M. A.

    1977-01-01

    Studies have been performed to examine the effect of NaCl vapor on the Na2SO4-induced hot corrosion of the alumina former NiAl. In the incubation period associated with such hot corrosion, NaCl(g) has been shown to be effective in removing aluminum from below the protective alumina scale and redepositing it as Al2O3 whiskers on the surface of the Na2SO4-coated sample. Similar effects seen in simple oxidation are associated with isothermal rupturing of the protective alumina scale.

  3. [Effect of K(+) on Na (+) fluxes and transport in barley roots: K(+)-stimulated Na (+) efflux in the root cortex].

    PubMed

    Jeschke, W D

    1972-03-01

    Barley roots grown on a nutrient solution containing 1 mM Na(+) but no K(+) are capable of a considerable Na(+) transport via the symplasm of the root and the xylem vessels. K(+) added to the medium surrounding the root cortex severely inhibits this transport after a lag period at a high rate constant (Fig. 3).It is likely that the fluxes of Na(+) are changed drastically during this transition from low to high K(+) status. Although originally limited to steady state fluxes, the extended method of efflux analysis for excised roots (Pitman, 1971) has been applied to the non-steady fluxes which occur upon the addition of K(+) to the roots. It is shown that besides other changes the efflux of (22)Na(+) through the cortex of barley roots is stimulated instantaneously (Fig. 5) by the addition of K(+) and presumably by an influx of K(+) ions. From this a transient, K(+)-stimulated Na(+) efflux at the plasmalemma of the cortical cells can be estimated. It amounts to 10.9 ? moles/g fw · h compared to the control efflux of 3.3 ? moles/g fw · h without K(+).The stimulated efflux is attributed to a Na(+) efflux pump at the plasmalemma and is thus related to the K-Na-selectivity of barley plants. The inhibition of the Na(+) transport by K(+) is probably a consequence of this increased efflux of Na(+) from the symplasm through the root cortex. PMID:24477899

  4. Thermal variation of the rotatory power of crystals of NaClO 3 and NaBrO 3

    Microsoft Academic Search

    M. S. Madhava

    1970-01-01

    The thermal variation of rotatory power of crystals of NaClO3 and NaBrO3 has been measured in the visible and ultraviolet region of the spectrum. The rotatory power of NaClO3\\u000a increases on heating whereas that of NaBrO3\\u000a decreases. On the other hand the refractive index decreases with rise of temperature for both crystals. The observations are shown\\u000a to be consistent with

  5. Electron spectrometric study of the internal energy distribution in Na2+ for single beam associative ionization

    Microsoft Academic Search

    H. A. J. Meijer; S. Schohl; M. W. Muller; H. Dengel; M.-W. Ruf; H. Hotop

    1991-01-01

    We present the internal energy distribution of Na: molecular ions formed in the associative ionization (AI) reactions Na(3p)+NaOp)+ Na:+e- and Na(4d)+ Na(3s)+ Na:+e-, as measured in a single beam by electron spectrometry. In both reactions the population of the higher vibrational levels is favoured. The cross section of the second reaction is found to he about two orders of magnitude

  6. Complete Bromide Surface Segregation in Mixed NaCl /NaBr Aerosols Grown from Droplets

    NASA Astrophysics Data System (ADS)

    Antonsson, Egill; Patanen, Minna; Nicolas, Christophe; Neville, John J.; Benkoula, Safia; Goel, Alok; Miron, Catalin

    2015-01-01

    Sea-salt aerosols are a source of atmospheric bromine responsible for ozone depletion. The availability of bromine from sea-salt aerosols to heterogeneous phase chemical reactions is determined by its local concentration at the aerosol surface. We report here complete surface segregation of bromine in mixed NaCl /NaBr aerosols grown by drying droplets, thus mimicking the atmospheric process by which solid sea-salt aerosols are generated. For d =70 nm solid aerosols, complete surface segregation is observed for solution Br /Cl ratios below 2%. These findings set a size-dependent upper limit on the bromine surface enrichment that can be reached in solid salt aerosols grown from sea-water droplets in the atmosphere.

  7. The effects of eslicarbazepine on persistent Na? current and the role of the Na? channel ? subunits.

    PubMed

    Doeser, Anna; Soares-da-Silva, Patricio; Beck, Heinz; Uebachs, Mischa

    2014-02-01

    Eslicarbazepine is the major active metabolite of eslicarbazepine acetate, a once-daily antiepileptic drug approved in Europe as adjunctive therapy for refractory partial-onset seizures in adults. This study was aimed to determine the effects of eslicarbazepine on persistent Na(+) currents (INaP) and the role of ? subunits in modulating these effects. To study the role of ? subunits of the Na(+) channel we used a mouse line genetically lacking either the ?1 or ?2 subunit, encoded by the SCN1B or SCN2B gene, respectively. Whole cell patch-clamp recordings were performed on CA1 neurons in hippocampal slices under control conditions and application of 300 ?M eslicarbazepine. We examined INaP in acutely isolated CA1 neurons and repetitive firing in hippocampal slices of mice lacking ? subunits and corresponding wild-type littermates. We found that eslicarbazepine caused a significant reduction of maximal INaP conductance and an efficient reduction of the firing rate in wild-type mice. We have shown previously a paradoxical increase of conductance of INaP caused by carbamazepine in mice lacking ?1 subunits in the subthreshold range, leading to a failure in affecting neuronal firing (Uebachs et al., 2010). In contrast, eslicarbazepine did not cause this paradoxical effect on INaP in SCN1B null mice. Consequently, the effects of eslicarbazepine on repetitive firing were maintained in these animals. These results indicate that eslicarbazepine exerts effects on INaP similar to those known for carbamazepine. However, in animals lacking the ?1 Na(+) channel subunit these effects are maintained. Therefore, eslicarbazepine potentially overcomes a previously described putative mechanism of resistance to established Na(+) channel acting antiepileptic drugs. PMID:24368131

  8. Na+/myo-inositol symporters and Na+/H+-antiport in Mesembryanthemum crystallinum.

    PubMed

    Chauhan, S; Forsthoefel, N; Ran, Y; Quigley, F; Nelson, D E; Bohnert, H J

    2000-11-01

    Mitr1 and Mitr2 from Mesembryanthemum crystallinum (common ice plant) are members of a family of genes homologous to H+[or Na+]/myo-inositol symporters (ITRs), not previously studied in plants. MITR1 complemented an Itr1-deficient yeast strain. Mitr1 is strongly expressed in roots, moderately in stems, and weakly in leaves. Its transcripts increased in all organs, most dramatically in roots, under salinity stress. Mitr2 constitutes a rare transcript, slightly upregulated by salt stress in leaves only. Mitr1 transcripts are present in all cells in the root tip, but become restricted to phloem-associated cells in mature roots. Peptide antibodies against the two proteins indicated the presence of MITR1 in all organs and of MITR2 in leaves. Both are located in the tonoplast. MITR1 acts in removing sodium from root vacuoles, correlated with findings of low root sodium, while leaf vacuoles accumulate sodium in the ice plant. Up-regulation in leaves and stems is also found for Na+/H+-antiporter (Nhx-type) transcripts. Under comparable stress conditions, Nhx-and Itr-like transcripts in Arabidopsis were regulated differently. In the ice plant, co-ordinate induction of Na+/H+-antiporters and Na+/myo-inositol symporters transfers sodium from vacuoles in root cells into the leaf mesophyll as a halophytic strategy that lowers the osmotic potential. The tissue-specific differential expression of Itr- and Nhx-type transcripts suggests that the vacuolar sodium/inositol symporters function to reduce sodium amounts in cells of the root and vascular tissue, while sodium/proton antiporters in leaf tissues function to partition sodium into vacuoles for storage. PMID:11115132

  9. Electrical conductivity and dielectric properties of polypyrrole/Na+-montmorillonite (PPy/Na+-MMT) clay nanocomposites

    NASA Astrophysics Data System (ADS)

    Rizvi, Tasneem Zahra; Shakoor, Abdul

    2009-05-01

    Frequency dependent ac conductivity (?ac), dielectric constant (?') and loss factor (?'') have been measured in the frequency range 100-106 Hz in polypyrrole/Na+-montmorillonite (PPy/Na+-MMT) clay nanocomposites. The nanocomposites were synthesized by in situ polymerization of pyrrole with varying amounts of Na+-MMT from 0.2 to 1.0 wt% in the presence of FeCl3 · 6H2O in an aqueous medium. All three measured quantities; ?ac, ?' and ?'' increased with the increase in MMT content in the composites at all frequencies. The frequency dependence of ?ac displayed a low frequency region of almost constant conductivity below 104 Hz, while above this frequency a rapid rise in ?ac was observed with the increase in frequency obeying a power law of frequency dependence with an exponent equal to 1. Both real and imaginary parts of the permittivity exhibited a low frequency dispersion which has been attributed to hopping of polarons and bipolarons in PPy and its composites.

  10. Moderate temperature rechargeable NaNiS2 cells

    NASA Technical Reports Server (NTRS)

    Abraham, K. M.

    1983-01-01

    A rechargeable sodium battery of the configuration, liquid Na/beta double prime -Al2O3/molten NaAlCl4, NiS2, operating in the temperature range of 170 to 190 C, is described. This battery is capable of delivering or = to 50 W-hr/1b and 1000 deep discharge/charge cycles.

  11. Pulse shape discrimination with a large NaI crystal

    NASA Astrophysics Data System (ADS)

    Doll, P.; Fink, G.; Haupenthal, M.; Finlay, R. W.; Hauber, S.; Klages, H. O.; Schieler, H.; Smend, F.; Wicke, G.-D.

    1989-12-01

    A large NaI Crystal (16 × 16 × 24 cm 3) is operated in a combined neutron and gamma-ray field in the energy range from 12 to 36 MeV. Pulse shape discrimination is employed to separate (n, charged particles) reaction products in NaI. Fluorescence efficiencies for various charged particles are studied.

  12. Adaptation of Tobacco Cells to NaCl 1

    PubMed Central

    Binzel, Marla L.; Hasegawa, Paul M.; Handa, Avtar K.; Bressan, Ray A.

    1985-01-01

    Cell lines of tobacco (Nicotiana tabacum L. var Wisconsin 38) were obtained which are adapted to grow in media with varying concentrations of NaCl, up to 35 grams per liter (599 millimolar). Salt-adapted cells exhibited enhanced abilities to gain both fresh and dry weight in the presence of NaCl compared to cells which were growing in medium without NaCl (unadapted cells). Tolerance of unadapted cells and cells adapted to 10 grams per liter NaCl was influenced by the stage of growth, with the highest degree of tolerance exhibited by cells in the exponential phase. Cell osmotic potential and turgor varied through the growth cycle of unadapted cells and cells at all levels of adaptation, with maximum turgor occurring at approximately the onset of exponential fresh weight accumulation. Adaptation to NaCl led to reduced cell expansion and fresh weight gain, while dry weight gain remained unaffected. This reduction in cell expansion was not due to failure of the cells to maintain turgor since cells adapted to NaCl underwent osmotic adjustment in excess of the change in water potential caused by the addition of NaCl to the medium. Tolerance of the adapted cells, as indicated by fresh or dry weight gain, did not increase proportionately with the increase in turgor. Adaptation of these glycophytic cells to NaCl appears to involve mechanisms which result in an altered relationship between turgor and cell expansion. Images Fig. 3 PMID:16664356

  13. Branching ratios for the beta decay of Na-21

    E-print Network

    Iacob, V. E.; Hardy, John C.; Gagliardi, Carl A.; Goodwin, J.; Nica, N.; Park, H. I.; Tabacaru, G.; Trache, L.; Tribble, Robert E.; Zhai, Y.; Towner, I. S.

    2006-01-01

    We have measured the beta-decay branching ratio for the transition from Na-21 to the first excited state of Ne-21. A recently published test of the standard model, which was based on a measurement of the beta-nu correlation in the decay of Na-21...

  14. Resurgent current of voltage-gated Na(+) channels.

    PubMed

    Lewis, Amanda H; Raman, Indira M

    2014-11-15

    Resurgent Na(+) current results from a distinctive form of Na(+) channel gating, originally identified in cerebellar Purkinje neurons. In these neurons, the tetrodotoxin-sensitive voltage-gated Na(+) channels responsible for action potential firing have specialized mechanisms that reduce the likelihood that they accumulate in fast inactivated states, thereby shortening refractory periods and permitting rapid, repetitive, and/or burst firing. Under voltage clamp, step depolarizations evoke transient Na(+) currents that rapidly activate and quickly decay, and step repolarizations elicit slower channel reopening, or a 'resurgent' current. The generation of resurgent current depends on a factor in the Na(+) channel complex, probably a subunit such as NaV?4 (Scn4b), which blocks open Na(+) channels at positive voltages, competing with the fast inactivation gate, and unblocks at negative voltages, permitting recovery from an open channel block along with a flow of current. Following its initial discovery, resurgent Na(+) current has been found in nearly 20 types of neurons. Emerging research suggests that resurgent current is preferentially increased in a variety of clinical conditions associated with altered cellular excitability. Here we review the biophysical, molecular and structural mechanisms of resurgent current and their relation to the normal functions of excitable cells as well as pathophysiology. PMID:25172941

  15. Transepithelial Na+ transport and the intracellular fluids: a computer study.

    PubMed

    Civan, M M; Bookman, R J

    1982-01-01

    Computer simulations of tight epithelia under three experimental conditions have been carried out, using the rheogenic nonlinear model of Lew, Ferreira and Moura (Proc. Roy. Soc. London. B 206:53-83, 1979) based largely on the formulation of Koefoed-Johnsen and Ussing (Acta Physiol. Scand. 42: 298-308. 1958). First, analysis of the transition between the short-circuited and open-circuited states has indicated that (i) apical Cl- permeability is a critical parameter requiring experimental definition in order to analyze cell volume regulation, and (ii) contrary to certain experimental reports, intracellular Na+ concentration (ccNa) is expected to be a strong function of transepithelial clamping voltage. Second, analysis of the effects of lowering serosal K+ concentration (csK) indicates that the basic model cannot simulate several well-documented observations; these defects can be overcome, at least qualitatively, by modifying the model to take account of the negative feedback interaction likely to exist between the apical Na+ permeability and ccNa. Third, analysis of the strongly supports the concept that osmotically induced permeability changes in the apical intercellular junctions play a physiological role in conserving the body's stores of NaCl. The analyses also demonstrate that the importance of Na+ entry across the basolateral membrane is strongly dependent upon transepithelial potential, cmNa and csK; under certain conditions, net Na+ entry could be appreciably greater across the basolateral than across the apical membrane. PMID:7057462

  16. The putative mechanism of Na+ absorption in euryhaline

    E-print Network

    Evans, David H.

    The putative mechanism of Na+ absorption in euryhaline elasmobranchs exists in the gills of a stenohaline marine elasmobranch, Squalus acanthias Keith P. Choe a,b,, Susan L. Edwards b,c , James B for active Na+ absorption. However, the vast majority of elasmobranchs are only found in marine environments

  17. Direct Measurement of {sup 21}Na+{alpha} Stellar Reaction

    SciTech Connect

    Binh, D. N.; Kubono, S.; Yamaguchi, H.; Hayakawa, S.; Hashimoto, T.; Kahl, D. [Center for Nuclear Study (CNS), University of Tokyo (Japan); Teranishi, T. [Department of Physics, Kuyshu University (Japan); Iwasa, N.; Kume, N. [Department of Physics, Tohoku University (Japan); Kato, S. [Department of Physics, Yamagata University (Japan); Khiem, L. H.; Tho, N. T. [Institute of Physics, Vietnamese Academy of Science and Technology (Viet Nam); Wakabayashi, Y. [Advanced Science Research Center, Japan Atomic Energy Agency (JAEA) (Japan)

    2010-08-12

    The measurement of the resonant alpha scattering and the {sup 21}Na({alpha}, p) reaction were performed for the first time in inverse kinematics with the thick target method using a {sup 21}Na radioisotope (RI) beam. This paper reports the current result of alpha scattering measurement and its astrophysics implication.

  18. The Na-K-ATPase and Calcium-Signaling Microdomains

    NSDL National Science Digital Library

    Jiang Tian (University of Toledo Health Science Campus Physiology and Pharmacology)

    2008-08-01

    The Na-K-ATPase is an energy-transducing ion pump that converts the free energy of ATP into transmembrane ion gradients. It also serves as a functional receptor for cardiotonic steroids such as ouabain and digoxin. Binding of ouabain to the Na-K-ATPase can activate calcium signaling in a cell-specific manner. The exquisite calcium modulation via the Na-K-ATPase is achieved by the ability of the pump to integrate signals from numerous protein and non-protein molecules, including ion transporters, channels, protein kinases/phosphatases, as well as cellular Na+. This review focuses on the unique properties of the Na-K-ATPase and its role in the formation of different calcium-signaling microdomains.

  19. LiNa5Mo9O30

    PubMed Central

    Hamza, Hamadi; Ennajeh, Ines; Zid, Mohamed Faouzi; Driss, Ahmed

    2012-01-01

    The tite compound, lithium penta­sodium nona­molybdate, LiNa5Mo9O30, was synthesized by solid-state reaction. The three-dimensional [Mo9O30]6? framework is built up from MoO6 octa­hedra and MoO5 bipyramids, linked together by edges and corners. The framework delimits two types of inter­secting tunnels running along [100] and [010] in which the Na+ and Li+ ions are located. The asymmetric unit contains one Mo, one Na and one Li site located on a twofold rotation axis. The crystal studied was a racemic twin with site a twin ratio of 0.51?(10):0.49?(10). Relationships between the structures of K2Mo3O10, K2Mo4O13, Cs2Mo7O22, Na6Mo10O33 and Na6Mo11O36 compounds are discussed. PMID:23284311

  20. Binding energy and geometry of e^+Na

    NASA Astrophysics Data System (ADS)

    Shertzer, Janine; Ward, S. J.

    2010-03-01

    We calculate the non-adiabatic binding energy and geometry of the weakly bound state of e^+Na. We use the Peach model potential to describe the e^+-Na^+ and e^--Na^+ interactions and solve the effective three-body Schrödinger equation with the finite element method. Because the model potential gives rise to three spurious states (corresponding to 1s, 2s, and 2p), the true non-adiabatic ground state of e^+Na is embedded in a dense spectrum of spurious states. We developed a technique for extracting the correct ground state for e^+Na, even when the energy is nearly degenerate with a spurious level. This is the first calculation to include the quadrupole term in the polarization potential.

  1. Study of acoustic activity of NaBrO3

    NASA Astrophysics Data System (ADS)

    Lin, Lin Quan; Tao, Fang; Shen, Zhi Gong; Ma, Wen Yi

    1987-05-01

    Acoustic activity in NaBrO3 has been studied by measurement of the degeneracy splitting of transverse acoustic waves with neutron scattering. The splitting ?? is proportional to wave vector q, instead of q2. It is the first sample which cannot be explained by phenomenological theory on acoustic activity. An additional study of NaBr0.7Cl0.3O3 showed that NaBrO3 and NaClO3 have opposite senses in acoustic activity. Further study of NaBrxCl1-xO3 may lead to a new subject which is concerned with the similar phenomenon in acoustics as in ferromagnetism.

  2. Uncertainties for ^22Na production in ONe novae

    NASA Astrophysics Data System (ADS)

    Wrean, P. R.; D'Auria, J. M.

    1999-10-01

    We report preliminary results using network calculations on the uncertainty for the production of ^22Na in ONe novae due to the uncertainty in the reaction rates in the hot Ne-Na cycle. We have varied the rates for the nine reactions of the Ne-Na cycle within their uncertainties, and have run all permutations of upper and lower limits for the Ne-Na reactions. Our fast-running code uses temperature-density profiles generated by a full hydro- and thermodynamic treatment of ONe novae (José, Coc and Hernanz, astro-ph/9902357). The reaction rates were taken from the recent compilation of the NACRE collaboration, Thielemann's REACLIB library, and several recent experimental and theoretical papers. We also pinpoint the nuclear reactions which contribute most to the uncertainty in the final ^22Na abundances.

  3. COLOMBIA: El IV Festival del Nuevo Teatro

    E-print Network

    Gonzá lez, Patricia E.

    1980-10-01

    a muerte y la ejecución está programada para el día siguiente. Mr. Smith compra al sheriff de Galveston y se lleva al negro, quien entonces asume el nombre de La bala de plata—TEC FALL 1980 83 Cristóbal Jones. El rumbo que llevan es una isla del... de mimos que vienen a divertirnos. Dentro del ambiente farandulero unos se convierten en músicos y otros en actores que nos cuentan una historia. Luego se desarrolla la tragicomedia de tantos caudillos derrocados en tantos países latinoamericanos y...

  4. The regio- and stereo-selective reduction of steroidal 4-en-3-ones using Na?S?O?/NaHCO? and CuCl/NaBH?.

    PubMed

    Wang, Chunli; Chen, Xiaoyu; Huang, Yaoqing; Yang, Jesse; Chen, Ying

    2013-12-20

    This paper describes the regio- and stereoselective reduction of ??-3-keto moiety in certain steroids using Na?S?O?/NaHCO? and CuCl/NaBH?, respectively. Using either one of the two reduction agents in the reaction, the 17-substituents in the D ring were observed to have clearly influenced the stereoselective reduction of 4-ene in the A ring by the so-called conformational transmission effect. Na?S?O?/NaHCO? regioselectively reduced CC at 4-position of 17-substituted-androst-4-en-3-one derivatives to 5?-H-3-one as the main isomer. And as an extended application, Epiandrosterone (11) was further synthesized from androst-4-en-3,17-dione (AD) via four steps. The total yield from this was about 45%. In the presence of CuCl/NaBH?, ??-3-keto conjugated reduction of 17-spirocyclic ethylene ketal protected androst-4-en-3-one derivatives mainly produced 3?-hydroxy-5?-H isomers, at a yield around 81%. Considering the scaffold configuration of 3?-hydroxy-5?-H moiety coincided with that of bile acid analogs, this selective reduction could also be used as an alternative method for the synthetic study of bile acids using AD and its derivatives, which are from the microorganism degradation of natural sterols, as the potential materials. Meanwhile, configurations of the reductive compounds 5b, 6b, 9, 10 and 17e were identified by X-ray diffraction. PMID:24128809

  5. Genome Sequences of Cupriavidus metallidurans Strains NA1, NA4, and NE12, Isolated from Space Equipment

    PubMed Central

    Monsieurs, Pieter; Mijnendonckx, Kristel; Provoost, Ann; Venkateswaran, Kasthuri; Ott, C. Mark; Leys, Natalie

    2014-01-01

    Cupriavidus metallidurans NA1, NA4, and NE12 were isolated from space and spacecraft-associated environments. Here, we report their draft genome sequences with the aim of gaining insight into their potential to adapt to these environments. PMID:25059868

  6. Effects of oligomycin on transient currents carried by Na+ translocation of Bufo Na+/K(+)-ATPase expressed in Xenopus oocytes.

    PubMed

    Ding, Yanli; Hao, Jingping; Rakowski, Robert F

    2011-10-01

    Na(+)/K(+)-ATPase (NKA) exports 3Na(+) and imports 2K(+) at the expense of the hydrolysis of 1ATP under physiological conditions. In the absence of K(+), it can mediate electroneutral Na(+)/Na(+) exchange. In the electroneutral Na(+)/Na(+) exchange mode, NKA produces a transient current containing fast, medium and slow components in response to a sudden voltage step. These three components of the transient current demonstrate the sequential release of Na(+) ions from three binding sites. Our data from oocytes provide further experimental support for the existence of these components. Oligomycin is an NKA inhibitor that favors the 2Na(+)-occluded state without affecting the conformational state of the NKA. We studied the effects of oligomycin on both K(+)-activated currents and transient currents in wild-type Bufo NKA and a mutant form of Bufo NKA, NKA: G813A. Oligomycin blocked almost all of the K(+)-activated current, although the three components of the transient current showed different sensitivities to oligomycin. The oligomycin-inhibited charge movement measured using a P/4 protocol had a rate coefficient similar to the medium transient component. The fast component of the transient current elicited by a short voltage step also showed sensitivity to oligomycin. However, the slow component was not totally inhibited by oligomycin. Our results indicate that the second and third sodium ions might be released to the extracellular medium by a mechanism that is not shared by the first sodium ion. PMID:21877177

  7. Two-step K Na and Ag Na ion-exchanged glass waveguides for C-band applications

    E-print Network

    Chen, Ray

    Two-step K ­Na and Ag ­Na ion-exchanged glass waveguides for C-band applications Jizuo Zou, Feng single-mode channel waveguides in BK7 glass for the telecom-wavelength region. The dependencies of insertion loss, polarization-dependent loss PDL , and bending loss of a curved waveguide on channel width

  8. NaO anticorrelation and horizontal branches. II. The NaO anticorrelation in the globular cluster NGC 6752

    Microsoft Academic Search

    E. Carretta; A. Bragaglia; R. G. Gratton; S. Lucatello; Y. Momany

    2007-01-01

    We are studying the Na-O anticorrelation in several globular clusters of different Horizontal Branch (HB) morphology in order to derive a possible relation between (primordial) chemical inhomogeneities and morphological parameters of the cluster population. We used the multifiber spectrograph FLAMES on the ESO Very Large Telescope UT2 and derived atmospheric parameters and elemental abundances of Fe, O and Na for

  9. A semiclassical study of laser-induced atomic fluorescence from Na2, K2 and NaK

    NASA Technical Reports Server (NTRS)

    Yuan, J.-M.; Bhattacharyya, D. K.; George, T. F.

    1982-01-01

    A semiclassical treatment of laser-induced atomic fluorescence for the alkali-dimer systems Na2, K2 and NaK is presented. The variation of the fluorescence intensity with the frequency of the exciting laser photon is studied and a comparison of theoretical results with a set of experimental data is presented.

  10. Otoczenie spoleczne i jego wplyw na wyniki ekonomiczne przedsibiorstwa na przykladzie instytucji nonprofit wiadczcej uslugi lecznicze i rehabilitacyjne.

    E-print Network

    Paris-Sud XI, Université de

    _wyniki_ekonomiczne_przedsi_biorstwa_na_przyk_adzie_instytucji_nonpr ofit_wiadcz_cej_us_ugi_lecznicze_i_rehabilitacyjne_autorstwa_K_Szagdaja_A_Miks a/888478 Recenzja 2: N_wyniki_ekonomiczne_przedsi_biorstwa_na_przyk_adzie_instytucji_nonpr ofit_wiadcz_cej_us_ugi_lecznicze_i_rehabilitacyjne_autorstwa_K_Szagdaja_Recenzj a_2_N_Wenc_a/888477 hal

  11. A Raman and MAS NMR study of mixed alkali Na–K and Na–Li aluminoborosilicate glasses

    Microsoft Academic Search

    N. Ollier; T. Charpentier; B. Boizot; G. Wallez; D. Ghaleb

    2004-01-01

    Structural studies of two types of aluminoborosilicate glasses (Na\\/K and Na\\/Li) using Raman and NMR spectroscopy are presented. Both types of glasses display a mixed alkali effect (MAE) according to electrical conductivity and Tg measurements. Concerning the glass structure and more particularly the silicate network, our results show that the MAE slightly affects the glass polymerization degree, which displays a

  12. Genome Sequences of Cupriavidus metallidurans Strains NA1, NA4, and NE12, Isolated from Space Equipment.

    PubMed

    Monsieurs, Pieter; Mijnendonckx, Kristel; Provoost, Ann; Venkateswaran, Kasthuri; Ott, C Mark; Leys, Natalie; Van Houdt, Rob

    2014-01-01

    Cupriavidus metallidurans NA1, NA4, and NE12 were isolated from space and spacecraft-associated environments. Here, we report their draft genome sequences with the aim of gaining insight into their potential to adapt to these environments. PMID:25059868

  13. Status for 2015, CERN NA63

    E-print Network

    Mikkelsen, RE; Wistisen, T

    2015-01-01

    We summarize the status for the CERN NA63 collaboration, where in 2015 we have had two runs at the CERN SPS, beamline H4: One with Ar ions at various energies around 75 GeV per nucleon, and one with electrons/positrons of 10-20 GeV. We previously refined and updated our theoretical analyses of bremsstrahlung and delta-electron emission from heavy, and medium-heavy, ultrarelativistic nuclei \\cite{Mikk15}. We thus concluded that - although not quite as interesting as for Pb projectiles - projectiles of Ar and/or Xe were suitable for the investigation, and for establishing the method to eventually measure the charge distribution of short-lived ($ct\\gtrsim3$m) fragments \\cite{Mikk14}. However, as the preliminary data analysis shows, the signal - which requires an intact projectile - is about three orders of magnitude lower than the background, stemming from photon emission (possibly originating from $\\pi^0$'s) in coincidence with projectiles that most likely are not intact after the collision. With the presently ...

  14. Tritium separation from Pb-17Li by permeation into Na or NaK and cold trapping

    SciTech Connect

    Reimann, J.

    1988-09-01

    The tritium extraction technique considered for a fusion reactor with a self-cooled Pb-17 Li blanket includes the permeation of the tritium into a Na or NaK intermediate loop and the precipitation as tritide in a cold trap. Tritium is recovered by thermal decomposition under vacuum. Basic kinetic studies of the thermal decomposition of sodium hydride are presented using different types of hydrides. The temperature range investigated was between 280 and 420/sup 0/C. Using fine NaH powder, the rate constants agreed well with those from other authors. For NaH crystals, the rate constants were lower by one order of magnitude and were similar to those obtained previously for coarse NaH powder.

  15. AREA DEL PERSONALE SETTORE PERSONALE DOCENTE E RICERCATORE

    E-print Network

    Milano-Bicocca, Università

    AREA DEL PERSONALE SETTORE PERSONALE DOCENTE E RICERCATORE UFFICIO GESTIONE CARRIERE Circolare n, infine, che non possono presentare domanda di prolungamento ai sensi del D.Lgs. 503/1992, i professori di

  16. ANNEX A L'INFORME DEL RECTOR DOCUMENT INFORMATIU

    E-print Network

    Casanellas, Marta

    /11. Reunió del Consejo de Universidades 08. Dinar-reunió dels rectors de l'ACUP amb el Molt Hble. Sr. Artur, Secretari d'Universitats i Recerca 27. Dinar cloenda FESTIBITY Convenis i documents signats amb protocol: 14

  17. Progetto di efficientamento energetico del Polo Universitario di Grugliasco

    E-print Network

    Sproston, Jeremy

    Progetto di efficientamento energetico del Polo Universitario di Grugliasco #12;Edifici Polo Polo comune delle aule ­ costruzione anno 2000 Dipartimento Scienze Veterinarie ­ costruzione anno 2000 2014 Grugliasco Consumi metano equivalente #12;Il progetto di efficientamento energetico del Polo

  18. Preparation of Al-La Master Alloy by Thermite Reaction in NaF-NaCl-KCl Molten Salt

    NASA Astrophysics Data System (ADS)

    Jang, Poknam; Li, Hyonmo; Kim, Wenjae; Wang, Zhaowen; Liu, Fengguo

    2015-05-01

    A NaF-NaCl-KCl ternary system containing La2O3 was investigated for the preparation of Al-La master alloy by the thermite reaction method. The solubility of La2O3 in NaF-NaCl-KCl molten salt was determined by the method of isothermal solution saturation. Inductively coupled plasma-optical emission spectroscopy and x-ray diffraction (XRD) analyses were used to consider the content of La2O3 in molten salt and the supernatant composition of molten salt after dissolution of La2O3, respectively. The results showed that the content of NaF had a positive influence on the solubility of La2O3 in NaF-NaCl-KCl molten salts, and the solubility of La2O3 could reach 8.71 wt.% in molten salts of 50 wt.%NaF-50 wt.% (44 wt.%NaCl + 56 wt.%KCl). The XRD pattern of cooling molten salt indicated the formation of LaOF in molten salt, which was probably obtained by the reaction between NaF and La2O3. The kinetic study showed that the thermite reaction was in accord with a first-order reaction model. The main influence factors on La content in the Al-La master alloy product, including molten salt composition, amount of Al, concentration of La2O3, stirring, reduction time and temperature, were investigated by single-factor experimentation. The content of La in the Al-La master alloy could be reached to 10.1 wt.%.

  19. A mutation in Na(+)-NQR uncouples electron flow from Na(+) translocation in the presence of K(+).

    PubMed

    Shea, Michael E; Mezic, Katherine G; Juárez, Oscar; Barquera, Blanca

    2015-01-20

    The sodium-pumping NADH:ubiquinone oxidoreductase (Na(+)-NQR) is a bacterial respiratory enzyme that obtains energy from the redox reaction between NADH and ubiquinone and uses this energy to create an electrochemical Na(+) gradient across the cell membrane. A number of acidic residues in transmembrane helices have been shown to be important for Na(+) translocation. One of these, Asp-397 in the NqrB subunit, is a key residue for Na(+) uptake and binding. In this study, we show that when this residue is replaced with asparagine, the enzyme acquires a new sensitivity to K(+); in the mutant, K(+) both activates the redox reaction and uncouples it from the ion translocation reaction. In the wild-type enzyme, Na(+) (or Li(+)) accelerates turnover while K(+) alone does not activate. In the NqrB-D397N mutant, K(+) accelerates the same internal electron transfer step (2Fe-2S ? FMNC) that is accelerated by Na(+). This is the same step that is inhibited in mutants in which Na(+) uptake is blocked. NqrB-D397N is able to translocate Na(+) and Li(+), but when K(+) is introduced, no ion translocation is observed, regardless of whether Na(+) or Li(+) is present. Thus, this mutant, when it turns over in the presence of K(+), is the first, and currently the only, example of an uncoupled Na(+)-NQR. The fact the redox reaction and ion pumping become decoupled from each other only in the presence of K(+) provides a switch that promises to be a useful experimental tool. PMID:25486106

  20. Del 1: Grunnleggende Digital CMOS YNGVAR BERG

    E-print Network

    Sahay, Sundeep

    Del 1: Grunnleggende Digital CMOS YNGVAR BERG I. Innhold TRANSISTOR SOM BRYTER anvendt i enkleMOS transistorer. Pass transistorer og transmisjonsporter. Tristate buffer og tristate inverter. Ulike typer. 2. Transistor som bryter. Kapittel 1.3 side 9. 3. CMOS inverter. Kapittel 1.4.1 side 10. 4. NAND

  1. MANUAL TELESCOPIO MONS OBSERVATORIO DEL TEIDE

    E-print Network

    (Apartado 1.5), situar la escalera al sur del pilar, de modo que la plataforma superior quede frente al cerca de la plataforma (S), de modo que pueda extraerse (o colocarse) la tapa de forma c´omoda. 3. Fijar

  2. LA ORGANIZACIÓN COMO ANTESALA DEL ÉXITO ACADÉMICO

    Microsoft Academic Search

    Ana García Gat

    2009-01-01

    Uno de los problemas más destacados del sistema educativo es el fracaso escolar, el cual se debe a la conjunción de un gran número de variables y circunstancias. Nos debemos preguntar, ¿Saben nuestros alumnos estudiar?, ¿han aprendido técnicas y procedimientos fundamentales para superar con éxito su proceso de enseñanza-aprendizaje?

  3. Facultad de Derecho DATOS DEL ALUMNO

    E-print Network

    Escolano, Francisco

    Facultad de Derecho DATOS DEL ALUMNO APELLIDOS 1º 2º NOMBRE NIF DIRECCIÓN LOCALIDAD CP PROVINCIA EMAIL TFNO. FIJO TFNO. MOVIL IMPORTANTE Para obtener los correspondientes títulos de Derecho y ADE, el elección, con los siguientes requisitos: - Los créditos de libre elección necesarios son 30,5 para Derecho

  4. DEL MORAL, SANDLER & MUERDTER--1 draft version

    E-print Network

    del Moral, Roger

    on the Muddy River Lahar, Mount St. Helens, Washington R. del Moral Jeremy E. Sandler Claire P. Muerdter Abstract We surveyed vegetation 28 summers after the 1980 eruption of Mount St. Helens, Washington spawned intervals = 20 ft (6.09 m). Study conducted between 900 and 1320 m a.s.l. Introduction Mount St. Helens

  5. Introduction to Triumpho del Govierno Popular

    Microsoft Academic Search

    Anne Oravetz Albert

    2004-01-01

    The Triumpho del Govierno Popular, y de la Antiguedad Holandesa by Miguel de Barrios (Daniel Levi de Barrios) describes the political and religious 'government' of the community, and includes accounts of its literary and charitable associations, along with poems, encomia, funeral orations, and other miscellanea from de Barrios' Jewish oeuvre. This excerpt constitutes the opening of the work, part of

  6. Stato di avanzamento del lavoro di tesi

    E-print Network

    Spagnolo, Filippo

    Stato di avanzamento del lavoro di tesi Luca Malagoli Dipartimento di Fisica e Tecnologie Relative in attesa di pubblicazione · Le scuole di storia della fisica, (con C.Romagnino), in uscita su La fisica for the history of Sciences · Premio Nobel per la fisica 2008: un caso paradigmatico per la storia della fisica

  7. UNIVERSIDAD SIMN BOLVAR Informe del proceso de

    E-print Network

    Vásquez, Carlos

    UNIVERSIDAD SIMÓN BOLÍVAR SECRETARÍA Informe del proceso de inscripción de los bachilleres asignados a la USB por el proceso CNU-OPSU 2012 22 de Febrero de 2013 #12;Universidad Simón Bolívar PROF Vicerrector Administrativo PROF. CRISTIÁN PUIG Secretario Elaboración Prof. Cristián Puig Lic. Lucy Pires #12

  8. Escuelas e interpretaciones del pensamiento administrativo

    Microsoft Academic Search

    Francisco Velásquez Vasquez

    2002-01-01

    El artículo siguiente presenta el proceso evolutivo que ha tenido el pensamiento administrativo a lo largo del siglo XX. Se distinguen tres etapas y en cada etapa se identifica una escuela de pensamiento. Esas escuelas son: la escuela Clásica, que tuvo su desarrollo durante el período comprendido entre 1900-1930, en el mundo occidental y en los contextos culturales de los

  9. Quina és la funció del gen clonat?

    Microsoft Academic Search

    Margarita Soriano; Francisca Guerola

    2008-01-01

    Presentem una activitat didàctica complementària per a alumnes de segon de batxillerat. A partir d’una seqüència de nucleòtids del genoma de Paenibacillus barcinonensis determinem la regió codificant d’un gen, la proteïna corresponent i la seva funció. Com a annex s’inclou el guió per a l’alumnat.

  10. LA TEORÍA DEL CAOS EN LA ECONOMÍA

    Microsoft Academic Search

    Fredy H. Wompner G

    2008-01-01

    En el presente trabajo se examinan los conceptos generales al uso sobre el caos. Se catalogan los conceptos clave que pueden ser útiles y que históricamente han conformado una teoría del desorden y su situación actual en diversas publicaciones. Se analiza desde su historia, evolución, principios e implicancias en otras disciplinas como en la economía. En esta dirección se realiza

  11. APUNTES PARA UN ESTUDIO DEL DISEÑO INDUSTRIAL

    Microsoft Academic Search

    Ignacio Casado Galván

    2009-01-01

    La máquina es quizá el factor dominante de nuestra época. Desde la primera mitad del XIX se desarrolla une nuevo sistema de acción sobre la materia y de producción de objetos permitiendo la multiplicación de objetos consecuencia de la producción en serie. El diseño industrial es así la forma característica de la producción de objetos de la sociedad industrial, es

  12. METODI MATEMATICI PRIMA PROVA in ITINERE del 17 novembre 2003

    E-print Network

    Gianazza, Ugo

    convergenza. Soluzione. Risulta z = 0 singolarit`a essenziale, Res(f, 0) = 1 - cos 1 z = 2i polo del primo ordine, Res(f, 2i) = e-i 2 z = -2i polo del primo ordine, Res(f, -2i) = ei 2 z singolarit`a eliminabile = -9 polo del primo ordine, Res(f, -9) = - 2 cos 1 27 z = 9 2 polo del primo ordine, Res(f, 9 2 ) = 2

  13. Rigidification of the autolysis loop enhances Na+ binding to thrombin

    PubMed Central

    Pozzi, Nicola; Chen, Raymond; Chen, Zhiwei; Bah, Alaji; Di Cera, Enrico

    2011-01-01

    Binding of Na+ to thrombin ensures high activity toward physiological substrates and optimizes the procoagulant and prothrombotic roles of the enzyme in vivo. Under physiological conditions of pH and temperature, the binding affinity of Na+ is weak due to large heat capacity and enthalpy changes associated with binding, and the Kd=80 mM ensures only 64% saturation of the site at the concentration of Na+ in the blood (140 mM). Residues controlling Na+ binding and activation have been identified. Yet, attempts to improve the interaction of Na+ with thrombin and possibly increase catalytic activity under physiological conditions have so far been unsuccessful. Here we report how replacement of the flexible autolysis loop of human thrombin with the homologous rigid domain of the murine enzyme results in a drastic (up to 10-fold) increase in Na+ affinity and a significant improvement in the catalytic activity of the enzyme. Rigidification of the autolysis loop abolishes the heat capacity change associated with Na+ binding observed in the wild-type and also increases the stability of thrombin. These findings have general relevance to protein engineering studies of clotting proteases and trypsin-like enzymes. PMID:21536369

  14. Hormonal regulation of Na -K -ATPase in cultured epithelial cells

    SciTech Connect

    Johnson, J.P.; Jones, D.; Wiesmann, W.P.

    1986-08-01

    Aldosterone and insulin stimulate Na transport through mechanisms involving protein synthesis. Na -K -ATPase has been implicated in the action of both hormones. The authors examined the effect of aldosterone and insulin on Na -K -ATPase in epithelial cells in culture derived from toad urinary bladder (TB6C) and toad kidney (A6). Aldosterone, but not insulin, increases short-circuit current (I/sub sc/) in TB6C cells. Aldosterone increases Na -K -(TSP)ATPase activity after 18 h of incubation, but no effect can be seen at 3 and 6 h. Amiloride, which inhibits aldosterone-induced increases in I/sub sc/, has no effect on either basal or aldosterone stimulated enzyme activity. Both aldosterone and insulin increase I/sub sc/ in A6 cells and when added together are synergistic. Aldosterone stimulates enzyme activity in A6 cells, but insulin alone has no effect. However, aldosterone and insulin together stimulate enzyme activity more than aldosterone alone. It appears that stimulation of Na -K -ATPase activity is involved in aldosterone action in both cell lines but does not appear to be due to increased Na entry, since enhanced enzyme activity is not inhibited by amiloride. In contrast, insulin alone has no direct effect on Na -K -ATPase, although the increased enzyme activity following both agents in combination may explain their synergism on I/sub sc/.

  15. Na+-sulfate cotransporter SLC13A1.

    PubMed

    Markovich, Daniel

    2014-01-01

    Sulfate is essential for normal physiology. The kidney plays a major role in sulfate homeostasis. Sulfate is freely filtered and strongly reabsorbed in the proximal tubule. The apical membrane Na(+)-sulfate cotransporter NaS1 (SLC13A1) mediates sulfate (re)absorption across renal proximal tubule and small intestinal epithelia. NaS1 encodes a 595-amino acid (? 66 kDa) protein with 13 putative transmembrane domains. Its substrate preferences are sodium and sulfate, thiosulfate, and selenate, and its activity is inhibited by molybdate, selenate, tungstate, thiosulfate, succinate, and citrate. NaS1 is primarily expressed in the kidney (proximal tubule) and intestine (duodenum to colon). NaS1 expression is down-regulated in the renal cortex by high sulfate diet, hypothyroidism, vitamin D depletion, glucocorticoids, hypokalemia, metabolic acidosis, and NSAIDs and up-regulated by low sulfate diet, thyroid hormone, vitamin D supplementation, growth hormone, chronic renal failure, and during post-natal growth. Disruption of murine NaS1 gene leads to hyposulfatemia and hypersulfaturia, as well as changes in metabolism, growth, fecundity, behavior, gut physiology, and liver detoxification. This suggests that NaS1 is an important sulfate transporter and its disruption leads to perturbed sulfate homeostasis, which contributes to numerous pathophysiological conditions. PMID:24193406

  16. Departamento de Ciencias del Mar y Biologa Aplicada Vdeo promocin estudios en Ciencias del Mar

    E-print Network

    Escolano, Francisco

    : "Desarrollo de capacidades para la gestión de la pesca sostenible en el suroeste del Océano Índico para preparar una nueva generación de profesionales cualificados en la gestión sostenible de la pesca

  17. Targeting Na(+) /K(+) -translocating adenosine triphosphatase in cancer treatment.

    PubMed

    Durlacher, Cameron T; Chow, Kevin; Chen, Xiao-Wu; He, Zhi-Xu; Zhang, Xueji; Yang, Tianxin; Zhou, Shu-Feng

    2015-05-01

    The Na(+) /K(+) -translocating adenosine triphosphatase (ATPase) transports sodium and potassium across the plasma membrane and represents a potential target in cancer chemotherapy. Na(+) /K(+) -ATPase belongs to the P-type ATPase family (also known as E1-E2 ATPase), which is involved in transporting certain ions, metals, and lipids across the plasma membrane of mammalian cells. In humans, the Na(+) /K(+) -ATPase is a binary complex of an ?-subunit that has four isoforms (?1 -?4 ) and a ?-subunit that has three isoforms (?1 -?3 ). This review aims to update our knowledge on the role of Na(+) /K(+) -ATPase in cancer development and metastasis, as well as on how Na(+) /K(+) -ATPase inhibitors kill tumour cells. The Na(+) /K(+) -ATPase has been found to be associated with cancer initiation, growth, development, and metastasis. Cardiac glycosides have exhibited anticancer effects in cell-based and mouse studies via inhibition of the Na(+) /K(+) -ATPase and other mechanisms. Na(+) /K(+) -ATPase inhibitors may kill cancer cells via induction of apoptosis and autophagy, radical oxygen species production, and cell cycle arrest. They also modulate multiple signalling pathways that regulate cancer cell survival and death, which contributes to their antiproliferative activities in cancer cells. The clinical evidence supporting the use of Na(+) /K(+) -ATPase inhibitors as anticancer drugs is weak. Several phase I and phase II clinical trials with digoxin, Anvirzel, and huachansu (an intravenous formulated extract of the venom of the wild toad), either alone or more often in combination with other anticancer agents, have shown acceptable safety profiles but limited efficacy in cancer patients. Well-designed randomized clinical trials with reasonable sample sizes are certainly warranted to confirm the efficacy and safety of cardiac glycosides for the treatment of cancer. PMID:25739707

  18. LA ENSEANZA EN INFORMACIN EN LA SOCIEDAD DEL CONOCIMIENTO : EL CASO DEL SISTEMA AGRCOLA EN FRANCIA

    E-print Network

    Paris-Sud XI, Université de

    LA ENSE�ANZA EN INFORMACI�N EN LA SOCIEDAD DEL CONOCIMIENTO : EL CASO DEL SISTEMA AGRÍCOLA EN y el uso de informaciones apoyándose en tecnologías de la información y de la comunicación. El conocimiento y a su reparto que fundan la dimensión societal y que erigen la educación y los sistemas escolares

  19. Gulliver dormido de Samuel Rovinski: Una parodia del discurso del poder

    E-print Network

    Rojas, Mario A.

    1990-10-01

    espaciales y actuando de acuerdo a las condiciones de un acto de habla plenamente acabado (o incumplido por trasgresiones a los postulados básicos de la comunicación). Además siguen reglas de conducta similares y los mismos actos ilocutivos del habla...), en el deber ineludible de explorar y señalar la verdad de los acontecimientos sociales, en la misión de un teatro que eduque mientras entretiene y que sabe despertar el espíritu crítico del público, me siento comprometido por mis FALL 1990...

  20. COMPORTAMENT DEL PAS DEL CAMPUS DE LA UIB, EN REFERNCIA A LA MOBILITAT

    E-print Network

    Oro, Daniel

    PARTICIPACIÓ VA SER MOLT ELEVADA 2. LA MILLORA DE LA CARRETERA, L'AVARIA DEL METRO EL CURS 2007-2008 I L; 39,9% Bus, Metro; 24; 16,8% Bus, Metro, Tren; 1; 0,7% Metro; 36; 25,2% Metro, Tren; 21; 14,7% Taxi, Metro, Bus; 1; 0,7% Taxi, Tren, Metro, Bus; 1; 0,7% Tren; 2; 1,4% ·Veient l'absurd dels resultats s

  1. In Situ Observation of Dehydration-Induced Phase Transformation from Na2Nb2O6-H2O to NaNbO3

    E-print Network

    Wang, Zhong L.

    In Situ Observation of Dehydration-Induced Phase Transformation from Na2Nb2O6-H2O to NaNbO3 Jong the phase transformation from a Sandia octahedral molecular sieve Na2Nb2O6-H2O to a piezoelectric NaNbO3 at high temperatures. After dehydration at 288 °C, the Na2Nb2O6-H2O becomes significantly destabilized

  2. Adsorptive removal of tetrahydrothiophene (THT) and tert-butylmercaptan (TBM) using NaY and AgNaY zeolites for fuel cell applications

    Microsoft Academic Search

    Doohwan Lee; Eun-Yong Ko; Hyun Chul Lee; Soonho Kim; Eun Duck Park

    2008-01-01

    Adsorptive removal of tetrahydrothiophene (THT) and tert-butylmercaptan (TBM) that are widely used sulfur odorants in pipeline natural gas was studied using AgNa-Y zeolites at ambient temperature and atmospheric pressure. The AgNa-Y were obtained via Ag+-exchange with Na+ of Na-Y at various exchange levels, and the contributions of formed adsorption sites (Ag+, Na+, Ag0, H+, and Ag2O) in the THT and

  3. Effects of Na2MoO4 and Na2WO4 on molybdenum and tungsten electrodes for the alkali metal thermoelectric converter (AMTEC)

    Microsoft Academic Search

    R. M. Williams; B. L. Wheeler; B. Jeffries-Nakamura; M. E. Loveland; C. P. Bankston

    1988-01-01

    The effects of adding Na2MoO4 and Na2WO4 to porous Mo and W electrodes, respectively, on the performance and impedance characteristics of the electrodes in an alkali metal thermoelectric converter (AMTEC) were investigated. It was found that corrosion of the porous electrode by Na2MoO4 or Na2WO4 to form Na2MO3O6 and WO2, respectively, and recrystallization of the Mo or W as the

  4. ACCORDO QUADRO DI COLLABORAZIONE CORPO NAZIONALE DEI VIGILI DEL FUOCO

    E-print Network

    Robbiano, Lorenzo

    ACCORDO QUADRO DI COLLABORAZIONE TRA CORPO NAZIONALE DEI VIGILI DEL FUOCO E UNIVERSITA' DEGLI STUDI DI GENOVA Il Corpo Nazionale dei Vigili del Fuoco (di seguito denominato Corpo Nazionale), C.F. n. 80219290584, rappresentato dal Direttore regionale dei vigili del fuoco della Liguria, Ing. Renato Riggio

  5. Evoluzione del mercato dei prodotti e servizi forestali e

    E-print Network

    Pettenella, Davide

    1 Evoluzione del mercato dei prodotti e servizi forestali e relativi problemi di governance Davide? Quadro congiunturale e cambiamenti strutturali del mercato del legname La crisi dei sub-prime in USA #12 in Russia e regioni limitrofe (Fonte: Jarno Seppala, PÖYRY, 2006) Distribuzione dei prelievi per tipo di

  6. DERECHOS DEL EMPLEADO LEy PARA LA PROtECCin

    E-print Network

    Rock, Chris

    DERECHOS DEL EMPLEADO LEy PARA LA PROtECCión DEL EMPLEADO COntRA LA PRuEbA DEL POLígRAfO PROHIBICIONES ExENCIONES DERECHOS DE LOS ExAMINADOS CUMPLIMIENTO Generalmente se le prohíbe al empleador que le aspirante a un trabajo por haberse negado a someterse a la prueba o por haberse acogido a otros derechos

  7. Realidades de la independencia del Banco de la República

    Microsoft Academic Search

    Salomón Kalmanovitz

    1997-01-01

    La autonomía del banco central colombiano es parte del proceso político que busca reducir el exagerado centralismo colombiano. Sin embargo, el poder central no fue limitado en grado suficiente por la Constitución de 1991, como demuestra el hecho de que el Ministro de Hacienda es el Presidente de la Junta Directiva del Banco de la República. Esto no sucede en

  8. 33 CFR 80.1118 - Marina Del Rey, CA.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...1 2010-07-01 2010-07-01 false Marina Del Rey, CA. 80.1118 Section 80.1118 Navigation and Navigable Waters...DEMARCATION LINES Pacific Coast § 80.1118 Marina Del Rey, CA. (a) A line drawn from Marina Del Rey Breakwater South...

  9. Lorica, una colonia árabe a orillas del río Sinú

    Microsoft Academic Search

    Joaquín Viloria De La Hoz

    2003-01-01

    En este artículo se estudian las circunstancias como llegaron los primeros inmigrantes árabes a Colombia desde finales del siglo XIX, así como sus actividades económicas más importantes. La investigación escogió a Lorica como punto de referencia, al ser una de las poblaciones más próspera de la subregión del Sinú durante el siglo XIX y primeras décadas del siguiente, en donde

  10. On the Approximations of Multiple target filtering P. Del Moral

    E-print Network

    Del Moral , Pierre

    On the Approximations of Multiple target filtering equations P. Del Moral Centre INRIA de Bordeaux (2010). To appear in Stochastic Analysis and Applications (2011). P. Del Moral (INRIA) INRIA Bordeaux Approximation models P. Del Moral (INRIA) INRIA Bordeaux-Sud Ouest 2 / 25 #12;Some notation : E measurable space

  11. On the Approximations of Multiple target filtering P. Del Moral

    E-print Network

    Del Moral , Pierre

    On the Approximations of Multiple target filtering equations P. Del Moral Centre INRIA Bordeaux (2010). To appear in Stochastic Analysis and Applications (2011). Del Moral (INRIA) INRIA Centre models 7 Approximation models Del Moral (INRIA) INRIA Centre Bordeaux-Sud Ouest, France 2 / 25 #12;Some

  12. Particle methods in stochastic engineering P. Del Moral

    E-print Network

    Del Moral , Pierre

    Particle methods in stochastic engineering P. Del Moral Centre INRIA Bordeaux-Sud Ouest 10th, Doucet. Fluctuations of Interacting Markov Chain Monte Carlo Models (2008) + Ref.. P. Del Moral (INRIA mechanics, financial math, biology, chemistry, rare event, optics, hybrid systems,... P. Del Moral (INRIA

  13. COMUNICATO STAMPA Nuove frontiere del Corso di Laurea in Fisioterapia

    E-print Network

    Costagliola, Gennaro

    COMUNICATO STAMPA Nuove frontiere del Corso di Laurea in Fisioterapia SALERNO, 30 maggio 2014 "Ricerca, didattica e formazione: nuove frontiere del Corso di Laurea in Fisioterapia" Campus di Baronissi in Fisioterapia intende promuovere un'ulteriore analisi della formazione universitaria del Fisioterapista

  14. 33 CFR 80.1118 - Marina Del Rey, CA.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...1 2011-07-01 2011-07-01 false Marina Del Rey, CA. 80.1118 Section 80.1118 Navigation and Navigable Waters...DEMARCATION LINES Pacific Coast § 80.1118 Marina Del Rey, CA. (a) A line drawn from Marina Del Rey Breakwater South...

  15. El Colegio Mayor del Rosario y la reforma universitaria Santanderista

    Microsoft Academic Search

    Luis Eduardo Fajardo; Carlos Cañon; Juanita Villaveces; Diego HERRERA

    2002-01-01

    Este trabajo presenta evidencia del impacto financiero y administrativo de la reforma educativa de Santander en una universidad privada de comienzos del siglo XIX en Colombia. La reforma educativa emprendida por el gobierno colombiano durante las dácadas de 1820 y 1830fue un ambicioso proyecto de modernización que era visto como una parte importante del proceso de rompimiento con el pasado

  16. Factores Reproductivos Asociados al Riesgo de Cncer del Seno

    E-print Network

    Danforth, Bryan Nicholas

    funcionamiento normal del seno como al riesgo de cáncer del seno. Se sabe que estar en edad avanzada al momento edad temprana es un factor protector. · Mientras más joven sea la mujer al momento de tener su primer hijo, menor es su riesgo de desarrollar cáncer del seno más tarde en la vida. · El riesgo de

  17. Hispanic and European Studies Program Ttulo del curso

    E-print Network

    Geffner, Hector

    Hispanic and European Studies Program Título del curso: Lengua de instrucción Profesora: Meritxell recomendados créditos Pre-requisitos del curso: Pre-requisitos de lengua universitario o equivalente. Enfoque general y disciplinar del curso: trata sobre la ciudad de Barcelona desde una perspectiva histórica

  18. Una breve gua para padres acerca del autismo: Informacin para

    E-print Network

    Sarkar, Nilanjan

    Tennessee y que recientemente haya recibido un diagnóstico de trastorno del espectro autista (ASD por sus o trastorno generalizado del desarrollo-no especificado (PDD-NOS por sus siglas en inglés). Incluso si usted ha estado sospechando un trastorno del espectro autista, recibir el diagnóstico puede

  19. Allyn Young y el desarrollo de la teoría del crecimiento

    Microsoft Academic Search

    Lauchlin Currie; Traducción de Álvaro Montenegro

    1993-01-01

    Con este artículo el autor busca rendir un tardío homenaje a quien fuera su maestro, Allyn Young. La teoría económica del crecimiento presenta, a juicio del autor, dos contribuciones fundamentales: la de Adam Smith, para quien la productividad nace de la profundización de la división del trabajo; y la de Allyn Young, quien retoma el análisis de Smith para explicar

  20. DISCURS DEL RECTOR DE LA UPF, JOSEP JOAN MORESO,

    E-print Network

    Geffner, Hector

    DISCURS DEL RECTOR DE LA UPF, JOSEP JOAN MORESO, AMB MOTIU DE LA INAUGURACI� DEL CURS 2007-2008 Sra. Blanca Palmada, comissionada per a Universitats i Recerca, Sra. Montserrat Ballarín, regidora d'Educació de l'Ajuntament de Barcelona, Sra. Mercè Sala, presidenta del Consell Social de la UPF, Sra. Amparo

  1. Pseudnimo: Bardo Thdol Viaje al "Techo del mundo"

    E-print Network

    Geffner, Hector

    Pseudónimo: Bardo Thödol Viaje al "Techo del mundo" #12;Entre címbalos, tambores y bailes chino,150 kilómetros de longitud y cruza montañas superiores a los 5000 metros por sobre el nivel del mar. El tiempo del primer recorrido fue de 13 horas y 26 minutos. No faltará mucho para que las agencias de viajes

  2. Albert Hirschman en Colombia y la planeación del desarrollo

    Microsoft Academic Search

    Caballero Argáez Carlos

    2009-01-01

    Este ensayo se refiere a los ejercicios de diagnóstico y formulación de estrategias de inversión pública en Colombia en los años cincuenta del siglo XX. Se hace un recuento de los antecedentes del Informe del Consejo Nacional de Planificación correspondiente al año de 1952, que contó con la asesoría de Albert Hirschman (quien residió en Colombia entre 1952 y 1956)

  3. Disposizione N. 4573/2014 del 20/11/2014

    E-print Network

    Guidoni, Leonardo

    orientamento Programma Marco Polo Il direttore VISTA: la L.168/1989 VISTO: il D.L.vo n.165 del 2001 e programma Marco Polo per l'anno accademico 2015-2016 Sapienza Università di Roma Area per l' del progetto Obiettivo del programma Marco Polo facilitare l'iscrizione di studenti cinesi ai corsi di

  4. Investigation of phase equilibria in the system Nd 2O 3–Na 2O–P 2O 5. The partial system NdPO 4–Na 4P 2O 7–NaPO 3

    Microsoft Academic Search

    Teresa Znamierowska; Szymon Bandrowski

    2008-01-01

    The NdPO4–Na4P2O7–NaPO3 system being part of the Nd2O3–Na2O–P2O5 oxide system was investigated by thermoanalytical methods, X-ray powder diffraction and microscopy in reflected light. On the basis of the obtained results its phase diagram is proposed. The investigated partial system is bounded by three subsystems (i) NdPO4–NaPO3, (ii) Na4P2O7–NaPO3 and (iii) NdPO4–Na4P2O7. In the system NdPO4–NaPO3 an intermediate compound – NaNdP2O7

  5. Gat1 (Gaba:Na+:Cl?) Cotransport Function

    PubMed Central

    Lu, Chin-Chih; Hilgemann, Donald W.

    1999-01-01

    Neurotransmitter transporters are reported to mediate transmembrane ion movements that are poorly coupled to neurotransmitter transport and to exhibit complex “channel-like” behaviors that challenge the classical “alternating access” transport model. To test alternative models, and to develop an improved model for the Na+- and Cl?-dependent ?-aminobutyric acid (GABA) transporter, GAT1, we expressed GAT1 in Xenopus oocytes and analyzed its function in detail in giant membrane patches. We detected no Na+- or Cl?- dependent currents in the absence of GABA, nor did we detect activating effects of substrates added to the trans side. Outward GAT1 current (“reverse” transport mode) requires the presence of all three substrates on the cytoplasmic side. Inward GAT1 current (“forward” transport mode) can be partially activated by GABA and Na+ on the extracellular (pipette) side in the nominal absence of Cl?. With all three substrates on both membrane sides, reversal potentials defined with specific GAT1 inhibitors are consistent with the proposed stoichiometry of 1GABA:2Na+:1Cl?. As predicted for the “alternating access” model, addition of a substrate to the trans side (120 mM extracellular Na+) decreases the half-maximal concentration for activation of current by a substrate on the cis side (cytoplasmic GABA). In the presence of extracellular Na+, the half-maximal cytoplasmic GABA concentration is increased by decreasing cytoplasmic Cl?. In the absence of extracellular Na+, half-maximal cytoplasmic substrate concentrations (8 mM Cl?, 2 mM GABA, 60 mM Na+) do not change when cosubstrate concentrations are reduced, with the exception that reducing cytoplasmic Cl? increases the half-maximal cytoplasmic Na+ concentration. The forward GAT1 current (i.e., inward current with all extracellular substrates present) is inhibited monotonically by cytoplasmic Cl? (Ki, 8 mM); cytoplasmic Na+ and cytoplasmic GABA are without effect in the absence of cytoplasmic Cl?. In the absence of extracellular Na+, current–voltage relations for reverse transport current (i.e., outward current with all cytoplasmic substrates present) can be approximated by shallow exponential functions whose slopes are consistent with rate-limiting steps moving 0.15–0.3 equivalent charges. The slopes of current–voltage relations change only little when current is reduced four- to eightfold by lowering each cosubstrate concentration; they increase twofold upon addition of 100 mM Na+ to the extracellular (pipette) side. PMID:10469733

  6. Two-frequency lidar technique for mesospheric Na temperature measurements

    NASA Technical Reports Server (NTRS)

    She, C. Y.; Latifi, H.; Yu, J. R.; Alvarez, R. J., II; Bills, R. E.

    1990-01-01

    This paper describes a new two-frequency lidar for measuring Na temperature profiles. The laser oscillator is tuned to the two operating frequencies by observing the Doppler-free structure of the Na D2 fluorescence spectrum in a vapor cell. The lidar technique and initial observations of the temperature profile between 82 and 102 km are described. Absolute temperature accuracies at the Na layer peak of better than + or - 3 K with a vertical resolution of 1 km and an integration period of approximately 5 min were achieved.

  7. The incommensurately modulated structures of the perovskites NaCeMnWO6 and NaPrMnWO6.

    PubMed

    García-Martín, Susana; King, Graham; Nénert, Gwilherm; Ritter, C; Woodward, Patrick M

    2012-04-01

    The structures of the doubly ordered perovskites NaCeMnWO(6) and NaPrMnWO(6), with rock salt ordering of the Mn(2+) and W(6+)B-site cations and layered ordering of the Na(+) and (Ce(3+)/Pr(3+)) A-site cations, have been studied by transmission electron microscopy, electron diffraction, neutron and synchrotron X-ray powder diffraction. Both compounds possess incommensurately modulated crystal structures. In NaCeMnWO(6) the modulation vector (with reference to the ideal ABX(3) perovskite subcell) is q ? 0.067a* (?58.7 Å) and in NaPrMnWO(6)q ? 0.046a* (?85.3 Å). In both compounds the superstructures are primarily the two-dimensional chessboard type, although some crystals of NaCeMnWO(6) were found with one-dimensional stripes. In some crystals of NaPrMnWO(6) there is a coexistence of chessboards and stripes. Modeling of neutron diffraction data shows that octahedral tilting plays an important role in the structural modulation. PMID:22385521

  8. NA49/NA61: results and plans on beam energy and system size scan at the CERN SPS

    E-print Network

    Gazdzicki, M

    2011-01-01

    This paper presents results and plans of the NA49 and NA61/SHINE experiments at the CERN Super Proton Synchrotron concerning the study of relativistic nucleus-nucleus interactions. First, the NA49 evidence for the energy threshold of creating quark-gluon plasma, the onset of deconfinement, in central lead-lead collisions around 30A GeV is reviewed. Then the status of the NA61/SHINE systematic study of properties of the onset of deconfinement is presented. Second, the search for the critical point of strongly interacting matter undertaken by both experiments is discussed. NA49 measured large fluctuations at the top SPS energy, 158A GeV, in collisions of light and medium size nuclei. They seem to indicate that the critical point exists and is located close to baryonic chemical potential of about 250 MeV. The NA61/SHINE beam energy and system size scan started in 2009 will provide evidence for the existence of the critical point or refute the interpretation of the NA49 fluctuation data in terms of the critical p...

  9. Epgrafe, Revista del Depto. de Matemticas y Fsica de la UAA Modelacin matemtica del control de plagas en un cultivo

    E-print Network

    Vela-Arevalo, Luz V.

    plagas, control discontinuo, impulsos. 1. Introducción Los modelos matemáticos y en particular, losEpígrafe, Revista del Depto. de Matemáticas y Física de la UAA Modelación matemática del control de función de impulsos repetidos infinitos. En el segundo modelo, el efecto del insecticida biológico se

  10. Stigma: il marchio sociale del suicidio In occasione della giornata mondiale per la prevenzione del suicidio, studiosi e

    E-print Network

    Di Pillo, Gianni

    Stigma: il marchio sociale del suicidio In occasione della giornata mondiale per la prevenzione del Stigma: un grande ostacolo per la prevenzione del suicidio. All'evento - promosso dall salute mentale. Lo stigma rappresenta il marchio negativo associato a coloro che hanno tentato il

  11. El tiempo es dinero: Cálculo del valor social del tiempo en Lima Metropolitana para usuarios de transporte urbano

    Microsoft Academic Search

    Denisse Calmet; Juan Miguel Capurro

    2011-01-01

    El objetivo de este trabajo es estimar el valor social del tiempo (VST) de los usuarios de transporte urbano en Lima Metropolitana. Con dicho fin, se presentan dos estimaciones del VST. En el primer caso, se utiliza información de la Encuesta Nacional de Hogares para aproximar el VST a partir del ingreso bruto mensual. En el segundo caso, utilizando información

  12. NECESIDADES DE FORMACIÓN DEL DOCENTE UNIVERSITARIO DEL CARIBE COLOMBIANO DE CIENCIAS ADMINISTRATIVAS ECONÓMICAS Y CONTABLES, DESDE LA COMPLEJIDAD

    Microsoft Academic Search

    Jose Enrique Rojas Chadid

    2010-01-01

    El escrito se propone mostrar las principales necesidades de formación del docente universitario del Caribe colombiano de ciencias administrativas económicas y contables, desde la complejidad, ya que la formación del docente universitario en la actualidad incluye en muy poca medida las ciencias de la complejidad lo que trae como consecuencia el refuerzo de una formación que privilegia el pensamiento lineal

  13. Ciclo de vida del VIH Enlace y fusin: El VIH empieza su ciclo de vida

    E-print Network

    Levin, Judith G.

    inversa convierte la cadena simple del ARN vírico en cadena doble de ADN vírico. Integración: El nuevo ADN integrasa "esconde" el ADN vírico dentro del propio ADN de la célula anfitriona. El ADN del VIH integrado se­800­448­0440. En Internet www.aidsinfo.nih.gov/infoSIDA. mayo del 2005 1 Human DNA HIV DNA ARN del VIH ADN del VIH

  14. Reactions of NaCl with gaseous SO3, SO2, and O2

    NASA Technical Reports Server (NTRS)

    Fielder, W. L.; Stearns, C. A.; Kohl, F. J.

    1984-01-01

    Hot corrosion of gas turbine engine components involves deposits of Na2SO4 which are produced by reactions between NaCl and oxides of sulfur. For the present investigation, NaCl single crystals were exposed at 100 to 850 C to gaseous mixtures of SO3, SO2, and O2. The products formed during this exposure depend, primarily, on the temperatures. The four product films were: NaCl-SO3; Na2S2O7; Na2SO4; and NaCl-Na2SO4. The kinetics of the reactions were measured.

  15. Reactions of NaCl with Gaseous SO3, SO2, and O2

    NASA Technical Reports Server (NTRS)

    Fielder, W. L.; Stearns, C. A.; Kohl, F. J.

    1983-01-01

    Hot corrosion of gas turbine engine components involves deposits of Na2SO4 which are produced by reactions between NaCl and oxides of sulfur. For the present investigation, NaCl single crystals were exposed at 100 to 850 C to gaseous mixtures of SO3, SO2, and O2. The products formed during this exposure depend, primarily, on the temperatures. The four product films were: NaCl-SO3; Na2S2O7; Na2SO4; and NaCl-Na2SO4. The kinetics of the reactions were measured.

  16. Effects of intra- and extracellular H + and Na + concentrations on Na + -H + antiport activity in the lacrimal gland acinar cells

    Microsoft Academic Search

    Yoshitaka Saito; Terutaka Ozawa; Akinori Nishiyama

    1990-01-01

    Kinetic properties of the Na+-H+ antiport in the acinar cells of the isolated, superfused mouse lacrimal gland were studied by measuring intracellular pH (pHi) and Na+ activity (aNai) with the aid of double-barreled H+- and Na+-selective microelectrodes, respectively. Bicarbonate-free solutions were used throughout. Under untreated control conditions, pHi was 7.12±0.01 and aNai was 6.7±0.6 mmol\\/l. The cells were acid-loaded by

  17. O3-type Na(Mn?.??Fe?.??Co?.??Ni?.??)O?: a quaternary layered cathode compound for rechargeable Na ion batteries

    DOE PAGESBeta

    Li, Xi [Massachusetts Institute of Technology, Cambridge, MA (United States). Dept. of Materials Science and Engineering; Zhou, Yong-Ning [Brookhaven National Laboratory (BNL), Upton, NY (United States); Wu, Di [Massachusetts Institute of Technology, Cambridge, MA (United States). Dept. of Mechanical Engineering; Liu, Lei [Massachusetts Institute of Technology, Cambridge, MA (United States). Dept. of Materials Science and Engineering; Ceder, Gerbrand [Massachusetts Institute of Technology, Cambridge, MA (United States). Dept. of Materials Science and Engineering; Yang, Xiao-Qing [Brookhaven National Laboratory (BNL), Upton, NY (United States)

    2014-12-01

    We report a new layered Na(Mn?.??Fe?.??Co?.??Ni?.??)O? compound with O3 oxygen stacking. It delivers 180 mAh/g initial discharge capacity and 578 Wh/kg specific energy density with good cycling capability at high cutoff voltage. In situ X-ray diffraction (XRD) shows a reversible structure evolution of O3-P3-O3'-O3'' upon Na de-intercalation. The excellent capacity and cycling performance at high cutoff voltage make it an important model system for studying the general issue of capacity fading in layered Na cathode compounds.

  18. Calculation of spectroscopic constants and radiative parameters for the B 1?- X 1?+ electronic transitions of NaK, NaRb, and NaCs molecules

    NASA Astrophysics Data System (ADS)

    Smirnov, A. D.

    2014-09-01

    The vibrational, rotational, and centrifugal spectroscopic constants and the radiative parameters (the Einstein coefficients, oscillator strengths, Frank-Condon factors, r v'v? centroids, and wavenumbers of rotational lines) of electronic-vibrational-rotational transitions in the systems of bands B 1? - X 1?+ of NaK (0 ? v' ? 14, 0 ? v? ? 52, j = 0, 30, 50, 70, 80, and 100), NaRb (0 ? v' ? 12, 0 ? v? ? 51, j = 0, 20, 30, 50, 70, 90, 100, and 120), and NaCs (0 ? v' ? 10, 0 ? v? ? 44, j = 0, 30, 50, 70, 90, 100, and 120) molecules, as well as the radiative lifetimes of excited electronic states, are calculated. Calculations are performed based on semiempirical potential curves constructed in this work. The calculated spectroscopic constants and the radiative lifetimes are compared with experimental values.

  19. Na+-K+ Pump Regulation and Skeletal Muscle Contractility

    NSDL National Science Digital Library

    MD Torben Clausen (University of Aarhus Department of Physiology)

    2003-10-01

    The present review is written with the specific purpose of analyzing how regulation of the activity and the capacity of the Na+-K+ pumps influences excitability and contractile performance in skeletal muscle.

  20. O, Na, Ba and Eu abundance patterns in open clusters

    E-print Network

    MacLean, B T; Lattanzio, J

    2014-01-01

    Open clusters are historically regarded as single-aged stellar populations representative of star formation within the Galactic disk. Recent literature has questioned this view, based on discrepant Na abundances relative to the field, and concerns about the longevity of bound clusters contributing to a selection bias: perhaps long-lived open clusters are chemically different to the star formation events that contributed to the Galactic disk. We explore a large sample of high resolution Na, O, Ba & Eu abundances from the literature, homogenized as much as reasonable including accounting for NLTE effects, variations in analysis and choice of spectral lines. Compared to a template globular cluster and representative field stars, we find no significant abundance trends, confirming that the process producing the Na-O anti-correlation in globular clusters is not present in open clusters. Furthermore, previously reported Na-enhancement of open clusters is found to be an artefact of NLTE effects, with the open cl...

  1. NaIrO3—A Pentavalent Post-perovskite

    SciTech Connect

    M Bremholm; S Dutton; P Stephens; R Cava

    2011-12-31

    Sodium iridium (V) oxide, NaIrO{sub 3}, was synthesized by a high pressure solid state method and recovered to ambient conditions. It is found to be isostructural with CaIrO{sub 3}, the much-studied structural analog of the high-pressure post-perovskite phase of MgSiO{sub 3}. Among the oxide post-perovskites, NaIrO{sub 3} is the first example with a pentavalent cation. The structure consists of layers of corner- and edge-sharing IrO{sub 6} octahedra separated by layers of NaO{sub 8} bicapped trigonal prisms. NaIrO{sub 3} shows no magnetic ordering and resistivity measurements show non-metallic behavior. The crystal structure, electrical and magnetic properties are discussed and compared to known post-perovskites and pentavalent perovskite metal oxides.

  2. Neutral Phospholipids Stimulate Na,K-ATPase Activity

    PubMed Central

    Haviv, Haim; Habeck, Michael; Kanai, Ryuta; Toyoshima, Chikashi; Karlish, Steven J. D.

    2013-01-01

    Membrane proteins interact with phospholipids either via an annular layer surrounding the transmembrane segments or by specific lipid-protein interactions. Although specifically bound phospholipids are observed in many crystal structures of membrane proteins, their roles are not well understood. Na,K-ATPase is highly dependent on acid phospholipids, especially phosphatidylserine, and previous work on purified detergent-soluble recombinant Na,K-ATPase showed that phosphatidylserine stabilizes and specifically interacts with the protein. Most recently the phosphatidylserine binding site has been located between transmembrane segments of ?TM8–10 and the FXYD protein. This paper describes stimulation of Na,K-ATPase activity of the purified human ?1?1 or ?1?1FXYD1 complexes by neutral phospholipids, phosphatidylcholine, or phosphatidylethanolamine. In the presence of phosphatidylserine, soy phosphatidylcholine increases the Na,K-ATPase turnover rate from 5483 ± 144 to 7552 ± 105 (p < 0.0001). Analysis of ?1?1FXYD1 complexes prepared with native or synthetic phospholipids shows that the stimulatory effect is structurally selective for neutral phospholipids with polyunsaturated fatty acyl chains, especially dilinoleoyl phosphatidylcholine or phosphatidylethanolamine. By contrast to phosphatidylserine, phosphatidylcholine or phosphatidylethanolamine destabilizes the Na,K-ATPase. Structural selectivity for stimulation of Na,K-ATPase activity and destabilization by neutral phospholipids distinguish these effects from the stabilizing effects of phosphatidylserine and imply that the phospholipids bind at distinct sites. A re-examination of electron densities of shark Na,K-ATPase is consistent with two bound phospholipids located between transmembrane segments ?TM8–10 and TMFXYD (site A) and between TM2, -4, -6, -and 9 (site B). Comparison of the phospholipid binding pockets in E2 and E1 conformations suggests a possible mechanism of stimulation of Na,K-ATPase activity by the neutral phospholipid. PMID:23430748

  3. Single Na+ channel currents observed in cultured rat muscle cells

    Microsoft Academic Search

    Frederick J. Sigworth; Erwin Neher

    1980-01-01

    The voltage- and time-dependent conductance of membrane Na+ channels is responsible for the propagation of action potentials in nerve and muscle cells. In voltage-step-clamp experiments on neurone preparations containing 104-107 Na+ channels the membrane conductance shows smooth variations in time, but analysis of fluctuations1,2 and other evidence3 suggest that the underlying single-channel conductance changes are stochastic, rapid transitions between `closed'

  4. An empirical NaKCa geothermometer for natural waters

    USGS Publications Warehouse

    Fournier, R.O.; Truesdell, A.H.

    1973-01-01

    An empirical method of estimating the last temperature of water-rock interaction has been devised. It is based upon molar Na, K and Ca concentrations in natural waters from temperature environments ranging from 4 to 340??C. The data for most geothermal waters cluster near a straight line when plotted as the function log ( Na K) + ?? log [ ??? (Ca) Na] vs reciprocal of absolute temperature, where ?? is either 1 3 or 4 3 depending upon whether the water equilibrated above or below 100??C. For most waters tested, the method gives better results than the Na K methods suggested by other workers. The ratio Na K should not be used to estimate temperature if ??? ( MCa) MNa is greater than 1. The Na K values of such waters generally yield calculated temperatures much higher than the actual temperature at which water interacted with the rock. A comparison of the composition of boiling hot-spring water with that obtained from a nearby well (170??C) in Yellowstone Park shows that continued water-rock reactions may occur during ascent of water even though that ascent is so rapid that little or no heat is lost to the country rock, i.e. the water cools adiabatically. As a result of such continued reaction, waters which dissolve additional Ca as they ascend from the aquifer to the surface will yield estimated aquifer temperatures that are too low. On the other hand, waters initially having enough Ca to deposit calcium carbonate during ascent may yield estimated aquifer temperatures that are too high if aqueous Na and K are prevented from further reaction with country rock owing to armoring by calcite or silica minerals. The Na-K-Ca geothermometer is of particular interest to those prospecting for geothermal energy. The method also may be of use in interpreting compositions of fluid inclusions. ?? 1973.

  5. Coupling mechanism of the oxaloacetate decarboxylase Na(+) pump.

    PubMed

    Dimroth, P; Jockel, P; Schmid, M

    2001-05-01

    The oxaloacetate decarboxylase Na(+) pump consists of subunits alpha, beta and gamma, and contains biotin as the prosthetic group. The peripheral alpha subunit catalyzes the carboxyltransfer from oxaloacetate to the prosthetic biotin group to yield the carboxybiotin enzyme. Subsequently, this is decarboxylated in a Na(+)-dependent reaction by the membrane-bound beta subunit. The decarboxylation is coupled to Na(+) translocation from the cytoplasm into the periplasm, and consumes a periplasmically derived proton. The gamma subunit contains a Zn(2+) metal ion which may be involved in the carboxyltransfer reaction. It is proposed to insert with its N-terminal alpha-helix into the membrane and to form a complex with the alpha subunit with its water-soluble C-terminal domain. The beta subunit consists of nine transmembrane alpha-helices, a segment (IIIa) which inserts from the periplasm into the membrane but does not penetrate it, and connecting hydrophilic loops. The most highly conserved regions of the molecule are segment IIIa and transmembrane helix VIII. Functionally important residues are D203 (segment IIIa), Y229 (helix IV) and N373, G377, S382 and R389 (helix VIII). The polar of these amino acids may constitute a network of ionizable groups which promotes the translocation of Na(+) and the oppositely oriented translocation of H(+) across the membrane. Evidence indicates that two Na(+) ions are bound simultaneously to subunit beta with D203 and S382 acting as binding sites. Sodium ion binding from the cytoplasm to both sites elicits decarboxylation of carboxybiotin possibly with the consumption of the proton extracted from S382 and delivered via Y229 to the carboxylated prosthetic group. A conformational change exposes the bound Na(+) ions toward the periplasm. With H(+) entering from the periplasm, the hydroxyl group of S382 is regenerated, and as a consequence, the Na(+) ions are released into this compartment. After switching back to the original conformation, Na(+) pumping continues. PMID:11248184

  6. NaCa exchange current in mammalian heart cells

    Microsoft Academic Search

    Junko Kimura; Akinori Noma; Hiroshi Irisawa

    1986-01-01

    Electrogenic Na-Ca exchange has been known to act in the cardiac sarcolemma as a major mechanism for extruding Ca ions1-3. Ionic flux measurements in cardiac vesicles have recently suggested that the exchange ratio is probably 3 Na:l Ca (refs 4, 5), although a membrane current generated by such a process has not been isolated. Using the intracellular perfusion technique6,7 combined

  7. Evolution of Na(+) and H(+) bioenergetics in methanogenic archaea.

    PubMed

    Schlegel, Katharina; Müller, Volker

    2013-02-01

    Methanogenic archaea live at the thermodynamic limit of life and use sophisticated mechanisms for ATP synthesis and energy coupling. The group of methanogens without cytochromes use an Na(+) current across the membrane for ATP synthesis, whereas the cytochrome-containing methanogens have additional coupling sites that also translocate protons. The ATP synthase in this group is promiscuous and uses Na(+) and H(+) simultaneously. PMID:23356322

  8. H- survival probability during collisions with Na/Cu(111)

    NASA Astrophysics Data System (ADS)

    Yu, S.; Bahrim, B.; Makarenko, B.; Rabalais, J. W.

    2015-06-01

    The survival probability of the H- ions colliding with a 0.25 ML Na covered Cu(111) surface is studied by both theory and experiment. We find that the survival probability is influenced by the projectile direction on surface. The reason is the different bonding between the Na atoms and their Cu neighbors along different surface directions. A stronger bond leads to a larger survival probability.

  9. Vanillin Reduction NaOH (1.0 M)

    E-print Network

    Taber, Douglass

    Vanillin Reduction H O O Me OH NaBH4 NaOH (1.0 M) O Me OH OH 1) 2) HCl vanillin vanillyl alcohol To a 25 mL round bottomed flask add vanillin (2.0 g), ethanol (4 mL) and a stir bar. The round bottomed flask is then clamped above the magnetic stirrer. Stir vanillin solution until it is homogeneous (5

  10. Molybdenum extraction from molybdenite concentrate in NaCl electrolyte

    Microsoft Academic Search

    Zhan-fang Cao; Hong Zhong; Guang-yi Liu; Yun-ren Qiu; Shuai Wang

    2010-01-01

    The electro-oxidation of molybdenite concentrate in NaCl electrolyte has been investigated. When the liquid–solid ratio is 25, mixing rate, 400rpm, pH=9, room temperature, concentration of NaCl, 4mol\\/L, then the dissolution rate of molybdenite can achieve 99.97% in 240min. With DSA (dimensionally stable anode) as anode, the polarization curves have been investigated. The results show that molybdenite concentrate cannot be electro-oxidated

  11. Accelerated chondrocyte functions on NaOH-treated PLGA scaffolds

    Microsoft Academic Search

    Grace E. Park; Megan A. Pattison; Thomas J. Webster

    2005-01-01

    Compared to conventional poly(lactic-co-glycolic acid) (PLGA), previous studies have shown that NaOH-treated PLGA two-dimensional substrates enhanced functions of osteoblasts (bone-forming cells), vascular and bladder smooth muscle cells, and chondrocytes (cartilage-synthesizing cells). In this same spirit, the purpose of this in vitro study was to fabricate three-dimensional NaOH-treated PLGA scaffolds and determine their efficacy toward articular cartilage applications. To improve functions

  12. Theoretical perspective on the NA62 physics program

    E-print Network

    Christopher Smith

    2010-12-16

    Soon the NA62 experiment will start looking for the rare K+ ---> pi+ nu nu bar decay. In this talk, its theoretical interests, together with those of the neutral rare decays KL ---> pi0 nu nu bar, KL ---> pi0 e+ e-, and KL ---> pi0 mu+ mu-, are briefly reviewed. Then, other possible targets for NA62 are discussed, among which the dominant semileptonic decays, the radiative decays, as well as the lepton-flavor violating decays.

  13. High Capacity Na+/H+ Exchange Activity in Mineralizing Osteoblasts

    PubMed Central

    Liu, Li; Schlesinger, Paul H.; Slack, Nicole M.; Friedman, Peter A.; Blair, Harry C.

    2015-01-01

    Osteoblasts synthesize bone in polarized groups of cells sealed by tight junctions. Large amounts of acid are produced as bone mineral is precipitated. We addressed the mechanism by which cells manage this acid load by measuring intracellular pH (pHi) in non-transformed osteoblasts in response to weak acid or bicarbonate loading. Basal pHi in mineralizing osteoblasts was ?7.3 and decreased by ? 1.4 units upon replacing extracellular Na+ with N-methyl-d-glucamine. Loading with 40 mM acetic or propionic acids, in normal extracellular Na+, caused only mild cytosolic acidification. In contrast, in Na+-free solutions, weak acids reduced pHi dramatically. After Na+ reintroduction, pHi recovered rapidly, in keeping with Na+/H+exchanger (NHE) activity. Sodium-dependent pHi recovery from weak acid loading was inhibited by amiloride with the Ki consistent with NHEs. NHE1 and NHE6 were expressed strongly, and expression was upregulated highly, by mineralization, in human osteoblasts. Antibody labeling of mouse bone showed NHE1 on basolateral surfaces of all osteoblasts. NHE6 occurred on basolateral surfaces of osteoblasts mainly in areas of mineralization. Conversely, elevated HCO3- alkalinized osteoblasts, and pH recovered in medium containing CI-, with or without Na+, in keeping with Na+-independent CI-/HCO3- exchange. The exchanger AE2 also occurred on the basolateral surface of osteoblasts, consistent with CI-/HCO3- exchange for elimination of metabolic carbonate. Overexpression of NHE6 or knockdown of NHE1 in MG63 human osteosarcoma cells confirmed roles of NHE1 and NHE6 in maintaining pHi. We conclude that in mineralizing osteoblasts, slightly basic basal pHi is maintained, and external acid load is dissipated, by high-capacity Na+/H+ exchange via NHE1 and NHE6. PMID:21413028

  14. El proyecto reformador del General José Ballivián. La construcción del Estado-Nación durante el gobierno provisional de 1841-1843

    Microsoft Academic Search

    Jordi Aizcorbe Sagrera

    2010-01-01

    Durante los dos primeros años del gobierno de José Ballivián (1841- 1847) se aprueba una numerosa legislación respecto a la Instrucción Pública, la reforma del ejército, la ocupación del territorio nacional y la reforma de la administración pública del estado. A raíz de esta legislación se establecen bases para el avance en la construcción del estado-nación boliviano mediante el control

  15. Consejo Asesor Consejo Asesor del Decanato de Estudios Tecnolgicos Acta 03-2013 del 05/04/13 Pg. 1 de 6

    E-print Network

    Vásquez, Carlos

    Consejo Asesor Consejo Asesor del Decanato de Estudios Tecnológicos Acta 03-2013 del 05/04/13 Pág Asesor del Decanato de Estudios Tecnológicos, presidido por el ciudadano Decano, Prof. Armando Jiménez Mejor Estudiante 7. Casos de estudiantes. 8. Varios 1. Consideración del Orden del Día Sometido

  16. Consejo Asesor Consejo Asesor del Decanato de Estudios Tecnolgicos Acta 04-2013 del 06/05/13 Pg. 1 de 5

    E-print Network

    Vásquez, Carlos

    anteriores 3. Informe del Decano 4. Indicadores de Gestión del Decanato de Estudios Tecnológicos 5. Casos deConsejo Asesor Consejo Asesor del Decanato de Estudios Tecnológicos Acta 04-2013 del 06/05/13 Pág Asesor del Decanato de Estudios Tecnológicos, presidido por el ciudadano Decano, Prof. Armando Jiménez

  17. Clinical and Laboratory Update on the DEL Variant.

    PubMed

    Nuchnoi, Pornlada; Thongbus, Jairak; Srisarin, Apapan; Kerdpin, Usanee; Prachayasittikul, Virapong

    2014-01-01

    Serological assays for the RhD blood group are based on detection of the RhD antigen on human red blood cells using a specific anti-D antibody. The weak expression of the RhD antigen in the DEL variant hinders the sensitivity of conventional serological assays. Evidence of anti-D immunization in patients with D-negativity who have received DEL-variant blood units has been reported in various populations. This observation has prompted the need for genetic epidemiological and clinical data on the DEL variant in the development of DEL molecular diagnostic testing. This review highlights the molecular features of the DEL variant, the clinical consequences of DEL-blood transfusion, and current approaches for detection of the DEL-variant for donor screening and transfusion. PMID:25316658

  18. thin films grown with additional NaF layers

    NASA Astrophysics Data System (ADS)

    Kim, Gee Yeong; Kim, Juran; Jo, William; Son, Dae-Ho; Kim, Dae-Hwan; Kang, Jin-Kyu

    2014-10-01

    CZTS precursors [SLG/Mo (300 nm)/ZnS (460 nm)/SnS (480 nm)/Cu (240 nm)] were deposited by RF/DC sputtering, and then NaF layers (0, 15, and 30 nm) were grown by electron beam evaporation. The precursors were annealed in a furnace with Se metals at 590°C for 20 minutes. The final composition of the CZTSSe thin-films was of Cu/(Zn + Sn) ~ 0.88 and Zn/Sn ~ 1.05, with a metal S/Se ratio estimated at ~0.05. The CZTSSe thin-films have different NaF layer thicknesses in the range from 0 to 30 nm, achieving a ~3% conversion efficiency, and the CZTSSe thin-films contain ~3% of Na. Kelvin probe force microscopy was used to identify the local potential difference that varied according to the thickness of the NaF layer on the CZTSSe thin-films. The potential values at the grain boundaries were observed to increase as the NaF thickness increased. Moreover, the ratio of the positively charged GBs in the CZTSSe thin-films with an NaF layer was higher than that of pure CZTSSe thin-films. A positively charged potential was observed around the grain boundaries of the CZTSSe thin-films, which is a beneficial characteristic that can improve the performance of a device.

  19. Del Norte means north to recycling

    SciTech Connect

    Aquino, J.T.

    1998-06-01

    Del Norte Regional Recycling and Transfer Station is owned by the city of Oxnard, California and operated by BLT Enterprises, Inc. The Del Norte facility--located in southwestern Ventura County about an hour northwest of Los Angeles--processes polyethylene terephthalate (PET) and high-density polyethylene (HDPE) plastic containers, aluminum, steel, glass, old corrugated containers (OCC), newspapers, computer printout paper, white and colored ledger paper, coated book, supermix paper, telephone books, and old magazines. According to the company, there has been virtually no community opposition to the site. The facility has few neighbors, and those are agricultural. To keep the community relationship strong, the facility`s design and location all but eliminated odor and noise complaints. The building was designed against the prevailing wind pattern, and BLT processes odorous material fast. A misting system installed for dust suppression also can be used with a solution for odor control should the need arise.

  20. II Congreso del Autor Dramático Iberoamericano

    E-print Network

    Unruh, Vicky

    1998-04-01

    two days of the Congress, June 26-27, and back in San Juan, Puerto Rican playwrights Carlos Canales, Aleyda Morales (President of Puerto Rico's Círculo Nacional de Autores Dramáticos), and José Luis Ramos Escobar spoke on the recent directions... en dos actos, under the direction of Jaime Velasco and with performances by José Ramón Segurajáuregui and Sergio Navarro. On June 26, Aleyda Morales staged her monologue Enigma de una mujer, performed by Ana Pino. The II Congreso del Autor...

  1. Premio Ollantay 1989 - Acta del jurado

    E-print Network

    1990-04-01

    20 LATIN AMERICAN THEATRE REVIEW Premios Ollantay 1989 - Acta del jurado Desde 1977 el Centro Latinoamericano de Creación e Investigación Teatral (CELCIT) otorga anualmente el Premio Latinoamericano "Ollantay," en reconocimiento a grupos... María Teresa Castillo, Luis Molina López, Juan Carlos Gene, Orlando Rodríguez B. y Luis Masci, reunido en Caracas el 30 de noviembre de 1989, acordó por unanimidad otorgar los siguientes galardones: 1. Hombre o Mujer de Teatro a Patricia Ariza, de...

  2. La evolucion del modernismo en Puerto Rico

    E-print Network

    Gonzalez-Hernandez, Miriam Mercedes

    1989-01-01

    en que dio impulso a las letras puertorriquenas y ademas, sus poetas defendieron el idioma en el momento historico- politico mas significativo que haya vivido la isla de Puerto Rico. DEDICATORIA Dedico esta tesis a mis hijos Jorge y Cristina, a... EVOLUCION DEL MODERNISMO. 23 Auge. Revista de las Antillas. 23 24 Poetas que mas influenciaron en el modernismo puertorriqueno. . . . . . . . . . IV MODERNISTAS INSULARES. 27 30 Poetas representativos. 30 CAPITULO pagina Virgilio Davila. Luis...

  3. Degenerations of del Pezzo surfaces I

    Microsoft Academic Search

    Paul Hacking; Yuri Prokhorov

    2005-01-01

    Let X be a surface with quotient singularities which admits a smoothing to the plane. We prove that X is a deformation of a weighted projective plane P(a^2,b^2,c^2), where a,b,c is a solution of the Markov equation a^2+b^2+c^2=3abc. We also prove a generalisation for del Pezzo surfaces of degree K^2 at least 5.

  4. [Na] and [K] dependence of the Na\\/K pump current-voltage relationship in guinea pig ventricular myocytes

    Microsoft Academic Search

    MASAKAZU NAKAO; DAVID C. GADSBY

    1989-01-01

    Na\\/K pump current was determined between - 140 and +60 mV as steady-state, strophanthidin-sensitive, whole-cell current in guinea pig ventricular myocytes, voltage-clamped and internally dialyzed via wide-tipped pipettes. Solu- tions were designed to minimize all other components of membrane current. A device for exchanging the solution inside the pipette permitted investigation of Na\\/K pump current-voltage (I-V) relationships at several levels

  5. Adsorption of Zn 2+ ions onto NaA and NaX zeolites: Kinetic, equilibrium and thermodynamic studies

    Microsoft Academic Search

    D. Nibou; H. Mekatel; S. Amokrane; M. Barkat; M. Trari

    2010-01-01

    The adsorption of Zn2+ onto NaA and NaX zeolites was investigated. The samples were synthesized according to a hydrothermal crystallization using aluminium isopropoxide (Al[OCH(CH3)2]3) as a new alumina source. The effects of pH, initial concentration, solid\\/liquid ratio and temperature were studied in batch experiments. The Freundlich and the Langmuir models were applied and the adsorption equilibrium followed Langmuir adsorption isotherm.

  6. Copper toxicity in cultured human skeletal muscle cells: the involvement of Na + \\/K + ATPase and the Na + \\/Ca 2+ -exchanger

    Microsoft Academic Search

    Ad A. G. M. Benders; Jie Li; Robert A. C. Lock; René J. M. Bindels; Sjoerd E. Wendelaar Bonga; Jacques H. Veerkamp

    1994-01-01

    Copper (Cu2+) intoxication has been shown to induce pathological changes in various tissues. The mechanism underlying Cu2+ toxicity is still unclear. It has been suggested that the Na+\\/K+-ATPase and\\/or a change of the membrane permeability may be involved. In this study we examined the effects of Cu2+ on the Na+ and Ca2+ homeostasis of cultured human skeletal muscle cells using

  7. Biodiesel production from rubber seed oil using poly (sodium acrylate) supporting NaOH as a water-resistant catalyst

    Microsoft Academic Search

    Ru Yang; Mengxing Su; Jianchun Zhang; Fuqiang Jin; Chunhong Zha; Min Li; Xinmin Hao

    2011-01-01

    Poly (sodium acrylate) supporting NaOH (NaOH\\/NaPAA) was prepared by in situ polymerization of aqueous solution of acrylic acid with an over-neutralization by adding excess of NaOH. NaOH\\/NaPAA presented a promising selectivity for water absorbency and good water retention with negligible swelling capacity in the organic solvents of methanol, glycerol, rubber seed oil methyl esters, and rubber seed oil. NaOH\\/NaPAA catalysts

  8. NaCl Taste Thresholds in 13 Inbred Mouse Strains

    PubMed Central

    Ishiwatari, Yutaka

    2012-01-01

    Molecular mechanisms of salty taste in mammals are not completely understood. We use genetic approaches to study these mechanisms. Previously, we developed a high-throughput procedure to measure NaCl taste thresholds, which involves conditioning mice to avoid LiCl and then examining avoidance of NaCl solutions presented in 48-h 2-bottle preference tests. Using this procedure, we measured NaCl taste thresholds of mice from 13 genealogically divergent inbred stains: 129P3/J, A/J, BALB/cByJ, C3H/HeJ, C57BL/6ByJ, C57BL/6J, CBA/J, CE/J, DBA/2J, FVB/NJ, NZB/BlNJ, PWK/PhJ, and SJL/J. We found substantial strain variation in NaCl taste thresholds: mice from the A/J and 129P3/J strains had high thresholds (were less sensitive), whereas mice from the BALB/cByJ, C57BL/6J, C57BL/6ByJ, CE/J, DBA/2J, NZB/BINJ, and SJL/J had low thresholds (were more sensitive). NaCl taste thresholds measured in this study did not significantly correlate with NaCl preferences or amiloride sensitivity of chorda tympani nerve responses to NaCl determined in the same strains in other studies. To examine whether strain differences in NaCl taste thresholds could have been affected by variation in learning ability or sensitivity to toxic effects of LiCl, we used the same method to measure citric acid taste thresholds in 4 inbred strains with large differences in NaCl taste thresholds but similar acid sensitivity in preference tests (129P3/J, A/J, C57BL/6J, and DBA/2J). Citric acid taste thresholds were similar in these 4 strains. This suggests that our technique measures taste quality–specific thresholds that are likely to represent differences in peripheral taste responsiveness. The strain differences in NaCl taste sensitivity found in this study provide a basis for genetic analysis of this phenotype. PMID:22293936

  9. Drift tube measurements on Na+ ions and clusters using the 24mNa+ tracer

    NASA Astrophysics Data System (ADS)

    Kasuya, A.; Abmayr, B.; Ohtsuki, T.; Masumoto, K.; Kotajima, H.; Huenges, E.; Morinaga, H.

    1997-06-01

    Mobilities of sodium ions and their clusters in different gases have been measured by gamma-ray spectrometry using the 20 ms isomeric state of 24Na as tracer. This isomer is obtained through the ?-decay of 24Ne, which was produced by bombarding 22Ne with the 7 MeV triton beam of a cyclotron. This new technique of measurement allows us to determine the mobility of sodium ions in non-reacting gases of a pressure above 1 mbar. Measurements have been carried out in gases of pressures ranging from 6 mbar to 1000 mbar under an electric field up to 250 V/cm at room temperature. The measured mobility of 24Na+ in pure neon gas at 1000 mbar was determined to be 3.2 cm2/Vs. This value is lower than the zero field mobility of about 8.5 cm2/Vs measured by Tyndall and Akridge. A small amount of polar molecules such as water or ethanol introduced into the drift tube causes their clustering with the sodium ions through monopole-dipole interaction, resulting in a strong decrease in the mobility. This clustering effect has been studied for various combinations of polar molecules and inert gases. The usable pressure range from 1 mbar to high pressures in the range of some hundred bars is interesting because most other methods for cluster studies cannot be done at such high pressures. With this method it is possible to measure the mobility change of sodium ions towards the condensation point and eventually even towards the critical point.

  10. The dynamic relationships between the three events that release individual Na? ions from the Na?/K?-ATPase.

    PubMed

    Gadsby, David C; Bezanilla, Francisco; Rakowski, Robert F; De Weer, Paul; Holmgren, Miguel

    2012-01-01

    Na(+)/K(+) pumps move net charge through the cell membrane by mediating unequal exchange of intracellular Na(+) and extracellular K(+). Most charge moves during transitions that release Na(+) to the cell exterior. When pumps are constrained to bind and release only Na(+), a membrane voltage-step redistributes pumps among conformations with zero, one, two or three bound Na(+), thereby transiently generating current. By applying rapid voltage steps to squid giant axons, we previously identified three components in such transient currents, with distinct relaxation speeds: fast (which nearly parallels the voltage-jump time course), medium speed (?(m)=0.2-0.5?ms) and slow (?(s)=1-10?ms). Here we show that these three components are tightly correlated, both in their magnitudes and in the time courses of their changes. The correlations reveal the dynamics of the conformational rearrangements that release three Na(+) to the exterior (or sequester them into their binding sites) one at a time, in an obligatorily sequential manner. PMID:22334072

  11. Upconversion improvement by the reduction of Na?-vacancies in Mn²? doped hexagonal NaYbF?:Er³? nanoparticles.

    PubMed

    Tian, Dongping; Gao, Dangli; Chong, Bo; Liu, Xuanzuo

    2015-03-01

    Hexagonal-phase NaYbF4:Er(3+) upconversion nanoparticles (UCNPs) have been synthesized via a co-precipitation method in high-boiling-point solvents, and remarkably enhanced upconversion luminescence, particularly in red emission bands (650-670 nm) in NaYbF4:Er(3+) UCNPs, has been achieved by Mn(2+) doping. The underlying reason for luminescence enhancement by Mn(2+) doping is explored by a series of controlled experiments, and a mechanism of enhancement based on the decrease of Na(+)-vacancies and organic adsorption is proposed. The Mn(2+) substitution disturbs the equilibrium of the charge and crystal lattice in the hexagonal-phase NaYbF4:Er(3+) UCNPs, which makes the Na(+)-vacancies that quenched luminescence become filled with Na(+) or Mn(2+) to offset the imbalance of the charge and electron cloud distortion. In addition, the Mn(2+) doping at the surface of UCNPs could reduce the organic adsorption on the surface of the UCNPs by an extra F(-) ion on the grain surface resulting in luminescence enhancement. Therefore, the Mn(2+)-doping approach provides a facile strategy for improvement of luminescence, which will impact on the field of bioimaging based on UCNP nanoprobes. PMID:25622805

  12. Effect of Na doping on flux pinning of YBa 1.9Na 0.1Cu 3O 7- ?

    NASA Astrophysics Data System (ADS)

    Ding, S. Y.; Leng, X.; Qiu, L.; Wang, Z. H.; Liu, Y.; Zhang, H.

    2003-03-01

    We have prepared Na-doped YBa 2Cu 3O y (YBa 1.9Na 0.1Cu 3O y+40 mol% Y211) (YBNCO) and Na-free YBa 2Cu 3O y (YBCO) samples by the melt-textured growth method to study the effect of doped Na ion on flux pinning. The ac susceptibility curves as well as the hysteresis loops were measured for the samples. Then the effective pinning energy ( U( T, Hdc, J)), irreversibility line ( Hirr( T)) and critical current density ( jc( Hdc)) were determined, where T, Hdc and J are temperature, dc magnetic field and current density, respectively. We found that, with Na doping, the Hirr( T) line shifted to lower temperatures while the Jc( Hdc) and U( T, Hdc, J) became smaller. Hence Na ions play a negative role in the flux pinning of YBCO. The appearance of the second peak in the Jc( Hdc) curves and the enhancement of anisotropy in YBNCO further support this finding.

  13. Improved measurements of Na+ fluxes in plants using calixarene-based microelectrodes.

    PubMed

    Jayakannan, Maheswari; Babourina, Olga; Rengel, Zed

    2011-07-01

    Ion-selective microelectrodes are a powerful tool in studying adaptive responses of plant cells and tissues to various abiotic stresses. However, application of this technique in Na(+) flux measurements was limited due to poor selectivity for Na(+) ions of commercially available Na(+) cocktails. Often, these cocktails cannot discriminate between Na(+) and other interfering ions such as K(+) and Ca(2+), leading to inaccurate measurements of Na(+) concentration and, consequently, inaccurate Na(+) flux calculations. To overcome this problem, three Na(+)-selective cocktail mixtures were prepared using tetramethoxyethyl ester derivative of p-t-butyl calix[4]arene. These cocktail mixtures were compared with commercially available ETH 227-based Na(+) cocktail for selectivity for Na(+) ions over other ions (particularly K(+) and Ca(2+)). Among the three calixarene-based Na(+) cocktails tested, cocktail 2 [in % w/w: Na(+) ionophore (4-tert-butylcalix[4]arene-tetra acetic acid tetraethyl ester) 3.5, the plasticizer (2-nitrophenyl octyl ether) 95.9 and lipophilic anion (potassium tetrakis (4-chlorophenyl) borate) 0.6] showed the best selectivity for Na(+) ions over K(+) and Ca(2+) ions and was highly stable over time (up to 10h). Na(+) flux measurements under a wide range of NaCl concentrations (25-150 mM) using Na(+) cocktail 2 established a clear dose-response relationship between severity of salt stress and magnitude of Na(+) influx at the distal elongation and mature zones of Arabidopsis thaliana roots. Furthermore, Na(+) cocktail 2 was compared with commercially available ETH 227-based Na(+) cocktail by measuring Na(+) fluxes at the two Arabidopsis root zones in response to 100mM NaCl treatment. With calixarene-based Na(+) cocktail 2, a large decreasing Na(+) influx (0-15 min) followed by small Na(+) influx (15-45 min) was measured, whereas with ETH-based Na(+) cocktail Na(+) influx was short-lived (1-3 min) and was followed by Na(+) efflux (3-45 min) that might have been due to K(+) and Ca(2+) efflux measured together with Na(+) influx. In conclusion, Na(+)-selective calixarene-based microelectrodes have excellent potential to be used in real-time Na(+) flux measurements in plants. PMID:21256620

  14. A sodium calcium arsenate, NaCa(AsO4)

    PubMed Central

    Lin, Jinru; Sun, Wei; Mi, Jin-Xiao; Pan, Yuanming

    2011-01-01

    The title compound, NaCa(AsO4), was synthesized using a hydro­thermal method at 633–643?K. It has a dense structure composed of alternating layers of distorted [CaO6] octa­hedra and layers of [AsO4] tetra­hedra and distorted [NaO6] octa­hedra, stacked along the a axis. The As, Ca and two O atoms lie on the mirror plane at y = 1/4 (i.e. 4c), while the Na atom lies on an inversion centre (1/2, 1/2, 0) (i.e. 4b). Each distorted [CaO6] octa­hedron shares four equatorial common O vertices with four neighboring octa­hedra, forming a layer parallel to (100), whereas each distorted [NaO6] octa­hedron shares two opposite edges with two neighboring ones, forming a chain running along [010]. Each isolated [AsO4] tetra­hedron shares two edges with two different [NaO6] octa­hedra in one [NaO6] chain and a vertex with another chain. Simultaneously the above [AsO4] tetra­hedron located in a four-membered [CaO6] ring shares one edge of its base facet with one [CaO6] octa­hedron and three corners with three other [CaO6] octa­hedra of one [CaO6] layer, and the remaining apex is shared with another [CaO6] layer. [NaO6] octa­hedra and [CaO6] octa­hedra are linked to each other by sharing edges and vertices. PMID:22199467

  15. The Expression Pattern of the Na(+) Sensor, Na(X) in the Hydromineral Homeostatic Network: A Comparative Study between the Rat and Mouse.

    PubMed

    Nehmé, Benjamin; Henry, Mélaine; Mouginot, Didier; Drolet, Guy

    2012-01-01

    The Scn7a gene encodes for the specific sodium channel Na(X), which is considered a primary determinant of sodium sensing in the brain. Only partial data exist describing the Na(X) distribution pattern and the cell types that express Na(X) in both the rat and mouse brain. To generate a global view of the sodium detection mechanisms in the two rodent brains, we combined Na(X) immunofluorescence with fluorescent cell markers to map and identify the Na(X)-expressing cell populations throughout the network involved in hydromineral homeostasis. Here, we designed an anti-Na(X) antibody targeting the interdomain 2-3 region of the Na(X) channel's ?-subunit. In both the rat and mouse, Na(X) immunostaining was colocalized with vimentin positive cells in the median eminence and with magnocellular neurons immunopositive for neurophysin associated with oxytocin or vasopressin in both the supraoptic and paraventricular nuclei. Na(X) immunostaining was also detected in neurons of the area postrema. In addition to this common Na(X) expression pattern, several differences in Na(X) immunostaining for certain structures and cell types were found between the rat and mouse. Na(X) was present in both NeuN and vimentin positive cells in the subfornical organ and the vascular organ of the lamina terminalis of the rat whereas Na(X) was only colocalized with vimentin positive cells in the mouse circumventricular organs. In addition, Na(X) immunostaining was specifically observed in NeuN immunopositive cells in the median preoptic nucleus of the rat. Overall, this study characterized the Na(X)-expressing cell types in the network controlling hydromineral homeostasis of the rat and mouse. Na(X) expression pattern was clearly different in the nuclei of the lamina terminalis of the rat and mouse, indicating that the mechanisms involved in systemic and central Na(+) sensing are specific to each rodent species. PMID:22833716

  16. El uso de la neuromodulación para el tratamiento del temblor

    PubMed Central

    Bendersky, Damián; Ajler, Pablo; Yampolsky, Claudio

    2014-01-01

    Introducción: El temblor puede ser un desorden incapacitante y el tratamiento de primera línea para estos pacientes es farmacológico. Sin embargo, este tratamiento puede llevar a una reducción satisfactoria del temblor en sólo el 50% de los pacientes con temblor esencial. La talamotomía era el tratamiento de elección para el temblor refractario al tratamiento médico hasta que comenzó a utilizarse la estimulación cerebral profunda (ECP) del núcleo ventral intermedio (Vim) del tálamo. En la actualidad, raramente se realiza la talamotomía. Métodos: Este artículo es una revisión no sistemática de las indicaciones, resultados, parámetros de programación y técnica quirúrgica de la ECP del Vim para el tratamiento del temblor. Resultados: Aunque los resultados clínicos son similares usando la talamotomía o la ECP del Vim, la primera causa más efectos adversos que la última. Además, la ECP puede ser usada bilateralmente, mientras que la talamotomía tiene un alto riesgo de causar disartria cuando se realiza de ambos lados. La ECP del Vim logró una adecuada mejoría del temblor en varias series de pacientes con temblor causado por temblor esencial, enfermedad de Parkinson o esclerosis múltiple. Además del Vim, hay otros blancos que están siendo usados por varios autores, tales como la zona incerta y las radiaciones prelemniscales. Conclusión: La ECP del Vim es un tratamiento útil para el temblor incapacitante refractario al tratamiento médico. Es esencial realizar una precisa selección de pacientes, así como utilizar una técnica quirúrgica correcta. Aún se desconoce el mejor blanco estereotáctico para el temblor, aunque el Vim es el más usado. PMID:25165613

  17. Morphology, geology and geochemistry of the "Salar del Gran Bajo del Gualicho" (Rio Negro, Argentina)

    USGS Publications Warehouse

    Angelucci, A.; Barbieri, M.; Brodtkorb, A.; Ciccacci, S.; Civitelli, G.; De Barrio, R.; Di, Filippo M.; Fredi, P.; Friedman, I.; Lombardi, S.; Schalamuk, A.I.; Toro, B.

    1996-01-01

    A multidisciplinary study of the Gran Bajo del Gualicho area (Rio Negro - Argentina) was carried out; the aim was to delineate its geological and geomorphological evolution and to estabilish the genesis of salts filling the depression. Climatic conditions were analized first to individuate their role in the present morphogenetic processes; moreover the main morphological features of present landscape were examined as well as the stratigraphy of the outcropping formations, and of the Gran Bajo del Gualicho Formation in particular. Finally, a possible geomorphological evolution of the studied area was traced. Geophysical analyses allowed to estabilish that the paleosurface shaped on the crystalline basement is strongly uneven and shows evidence of the strong tectonic phases it underwent. The result of isotope analyses confirmed that the salt deposits on the Gran Bajo del Gualicho bottom were produced by fresh water evaporation, while strontium isotope ratio suggested that such waters were responsible for solubilization of more ancient evaporitic deposits.

  18. Estudio teórico del CO2. Orbitales de valencia y del ``core''

    NASA Astrophysics Data System (ADS)

    Olalla Gutiérrez, E.

    Hemos calculado las intensidades de las transiciones E1 a los miembros de las series de Rydberg con origen en los orbitales ``no enlazantes'' del dióxido de carbono, especie de conocida relevancia atmosférica. Se han computado, asimismo, los continuos de fotoionización correspondientes a los distintos canales de ionización, representándolos como densidad espectral de fuerza de oscilador frente a la energía del fotón incidente; mostramos los resultados df/dE para la fotoionización total de esta especie en el intervalo 15-60 eV. Todos los cálculos se han llevado a cabo mediante la formulación Molecular del Método de los Orbitales de Defecto Cuántico, MQDO [1,2]. La calidad de los resultados que presentamos se ha evaluado en base a la comparación con los datos, tanto experimentales como teóricos, disponibles en la bibliografía. El acuerdo encontrado es altamente satisfactorio

  19. Fiscalizao e Controle: O Poder Legislativo na Argentina e no Brasil Contemporneos

    E-print Network

    Paris-Sud XI, Université de

    1 Fiscalização e Controle: O Poder Legislativo na Argentina e no Brasil Contemporâneos Charles na Argentina e no Brasil Contemporâneos "La société a le droit de demander compte à tout agent public concentrar-se na análise das novas instituições de controle externo no Brasil e na Argentina, de acordo com o

  20. Na7Mg13Nd(PO4)12

    PubMed Central

    Jerbi, Hasna; Hidouri, Mourad; Mongi, Ben Amara

    2012-01-01

    Investigations of the quasi-ternary system Na3PO4–Mg3(PO4)2–NdPO4 allowed us to obtain the new phosphate hepta­sodium trideca­magnesium neodymium dodeca­kis­phosphate, Na7Mg13Nd(PO4)12, by applying a flux method. The crystal structure is isotypic with that of the previously reported Na7Mg13 Ln(PO4)12 (Ln = Eu, La) compounds. It consists of a complex three-dimensional framework built up from an NdO8 polyhedron (m symmetry), an MO6 octa­hedron statistically occupied by M = Mg and Na, and eight MgOx (x = 5, 6) polyhedra (four with site symmetry m), linked either directely by sharing corners, edges and faces, or by one of the eight unique PO4 tetra­hedra through common corners. Two of the PO4 tetra­hedra are statisticaly disordered over a mirror plane. The whole structure can be described as resutling from an assembly of two types of structural units, viz [Mg4 MP4O22]? 2 layers extending parallel to (100) and stacked along [100], and [Mg4NdP4O36]? 1 undulating chains running along the [010] direction. The six different Na+ cations (five with site symmetry m and one with 0.5 occupancy) are situated in six distinct cavities delimited by the framework. The structure was refined from data of a racemic twin. PMID:22719275

  1. Magnetism in Na-filled Fe-based skutterudites

    PubMed Central

    Xing, Guangzong; Fan, Xiaofeng; Zheng, Weitao; Ma, Yanming; Shi, Hongliang; Singh, David J.

    2015-01-01

    The interplay of superconductivity and magnetism is a subject of ongoing interest, stimulated most recently by the discovery of Fe-based superconductivity and the recognition that spin-fluctuations near a magnetic quantum critical point may provide an explanation for the superconductivity and the order parameter. Here we investigate magnetism in the Na filled Fe-based skutterudites using first principles calculations. NaFe4Sb12 is a known ferromagnet near a quantum critical point. We find a ferromagnetic metallic state for this compound driven by a Stoner type instability, consistent with prior work. In accord with prior work, the magnetization is overestimated, as expected for a material near an itinerant ferromagnetic quantum critical point. NaFe4P12 also shows a ferromagnetic instability at the density functional level, but this instability is much weaker than that of NaFe4Sb12, possibly placing it on the paramagnetic side of the quantum critical point. NaFe4As12 shows intermediate behavior. We also present results for skutterudite FeSb3, which is a metastable phase that has been reported in thin film form. PMID:26027504

  2. Magnetism in Na-filled Fe-based skutterudites.

    PubMed

    Xing, Guangzong; Fan, Xiaofeng; Zheng, Weitao; Ma, Yanming; Shi, Hongliang; Singh, David J

    2015-01-01

    The interplay of superconductivity and magnetism is a subject of ongoing interest, stimulated most recently by the discovery of Fe-based superconductivity and the recognition that spin-fluctuations near a magnetic quantum critical point may provide an explanation for the superconductivity and the order parameter. Here we investigate magnetism in the Na filled Fe-based skutterudites using first principles calculations. NaFe4Sb12 is a known ferromagnet near a quantum critical point. We find a ferromagnetic metallic state for this compound driven by a Stoner type instability, consistent with prior work. In accord with prior work, the magnetization is overestimated, as expected for a material near an itinerant ferromagnetic quantum critical point. NaFe4P12 also shows a ferromagnetic instability at the density functional level, but this instability is much weaker than that of NaFe4Sb12, possibly placing it on the paramagnetic side of the quantum critical point. NaFe4As12 shows intermediate behavior. We also present results for skutterudite FeSb3, which is a metastable phase that has been reported in thin film form. PMID:26027504

  3. Adenosine, type 1 receptors: role in proximal tubule Na+ reabsorption

    PubMed Central

    Welch, William J

    2015-01-01

    Adenosine type 1 receptor (A1-AR) antagonists induce diuresis and natriuresis in experimental animals and humans. Much of this effect is due to inhibition of A1-ARs in the proximal tubule, which is responsible for 60–70% of the reabsorption of filtered Na+ and fluid. Intratubular application of receptor antagonists indicates that A1-AR mediates a portion of Na+ uptake in PT and PT cells, via multiple transport systems, including Na+/H+ exchanger-3 (NHE3), Na+/PO4? co-transporter and Na+-dependent glucose transporter, SGLT. Renal microperfusion and recollection studies have shown that fluid reabsorption is reduced by A1-AR antagonists and is lower in A1-AR KO mice., compared to WT mice. Absolute proximal reabsorption (APR) measured by free-flow micropuncture is equivocal, with studies that show either lower APR or similar APR in A1-AR KO mice, compared to WT mice. Inhibition of A1-ARs lowers elevated blood pressure in models of salt-sensitive hypertension, partially due to their effects in the proximal tubule. PMID:25345761

  4. Ouabain Binding Site in a Functioning Na+/K+ ATPase*

    PubMed Central

    Sandtner, Walter; Egwolf, Bernhard; Khalili-Araghi, Fatemeh; Sánchez-Rodríguez, Jorge E.; Roux, Benoit; Bezanilla, Francisco; Holmgren, Miguel

    2011-01-01

    The Na+/K+ ATPase is an almost ubiquitous integral membrane protein within the animal kingdom. It is also the selective target for cardiotonic derivatives, widely prescribed inhibitors for patients with heart failure. Functional studies revealed that ouabain-sensitive residues distributed widely throughout the primary sequence of the protein. Recently, structural work has brought some consensus to the functional observations. Here, we use a spectroscopic approach to estimate distances between a fluorescent ouabain and a lanthanide binding tag (LBT), which was introduced at five different positions in the Na+/K+ ATPase sequence. These five normally functional LBT-Na+/K+ ATPase constructs were expressed in the cell membrane of Xenopus laevis oocytes, operating under physiological internal and external ion conditions. The spectroscopic data suggest two mutually exclusive distances between the LBT and the fluorescent ouabain. From the estimated distances and using homology models of the LBT-Na+/K+ ATPase constructs, approximate ouabain positions could be determined. Our results suggest that ouabain binds at two sites along the ion permeation pathway of the Na+/K+ ATPase. The external site (low apparent affinity) occupies the same region as previous structural findings. The high apparent affinity site is, however, slightly deeper toward the intracellular end of the protein. Interestingly, in both cases the lactone ring faces outward. We propose a sequential ouabain binding mechanism that is consistent with all functional and structural studies. PMID:21911500

  5. Electronic structure and molecular dynamics of Na2Li

    NASA Astrophysics Data System (ADS)

    Malcolm, Nathaniel O. J.; McDouall, Joseph J. W.

    Following the first report (Mile, B., Sillman, P. D., Yacob, A. R. and Howard, J. A., 1996, J. chem. Soc. Dalton Trans , 653) of the EPR spectrum of the mixed alkali-metal trimer Na2Li a detailed study has been made of the electronic structure and structural dynamics of this species. Two isomeric forms have been found: one of the type, Na-Li-Na, of C , symmetry and another, Li-Na-Na, of C symmetry. Also, there are two linear saddle points which correspond to 'inversion' transition structures, and a saddle point of C symmetry which connects the two minima. A molecular dynamics investigation of these species shows that, at the temperature of the reported experiments (170 K), the C minimum is not 'static', but undergoes quite rapid inversion. At higher temperatures the C minimum converts to the C form, but by a mechanism very different from that suggested by minimum energy path considerations. 2 2v s s 2v 2v s

  6. Effects of Osmoprotectants upon NaCl Stress in Rice.

    PubMed Central

    Garcia, A. B.; Engler, JdA.; Iyer, S.; Gerats, T.; Van Montagu, M.; Caplan, A. B.

    1997-01-01

    Plants accumulate a number of osmoprotective substances in response to NaCl stress, one of them being proline (Pro). While characterizing some of the changes in solute accumulation in NaCl-stressed rice (Oryza sativa L.), we identified several other potential osmoprotectants. One such substance, trehalose, begins to accumulate in small amounts in roots after 3 d. We performed a series of experiments to compare the effects of Pro and trehalose on ion accumulation to determine whether the two chemicals protect the same physiological processes. We found that Pro either has no effect or, in some cases, exasperates the effect of NaCl on growth inhibition, chlorophyll loss, and induction of a highly sensitive marker for plant stress, the osmotically regulated salT gene. By contrast, low to moderate concentrations of trehalose reduce Na+ accumulation, salT expression, and growth inhibition. Somewhat higher concentrations (10 mM) prevent NaCl-induced loss of chlorophyll in blades, preserve root integrity, and enhance growth. The results of this study indicate that during osmotic stress trehalose or carbohydrates might be more important for rice than Pro. PMID:12223797

  7. NaI detector neutron activation spectra for PGNAA applications

    PubMed

    Gardner; El; Zheng; Hayden; Mayo

    2000-10-01

    When NaI detectors are used in prompt gamma-ray neutron activation analysis devices, they are activated by neutrons that penetrate the detector. While thermal neutron filters like boron or lithium can be used to reduce this activation, it can never be completely eliminated by this approach since high energy neutrons can penetrate the detector and thermalize inside it. This activation results in the emission of prompt gamma rays from both the I and Na and the production of the radioisotopes 128I and 24Na that subsequently decay and emit their characteristic beta particles and gamma rays. The resulting three spectra represent a background for this measurement. An experimental method for obtaining these three spectra is described and results are reported for 2" x 2", 5" x 5", 6" x 6", and 1" x 6" NaI detectors using the thermal neutron beam of the NCSU PULSTAR nuclear reactor. In addition, Monte Carlo simulation programs have been developed and used for simulating these spectra. Good results have been obtained by the Monte Carlo method for the two radioisotope spectra, and it is anticipated that good results will also be obtained for the prompt gamma-ray spectrum when the I and Na coincidence schemes are known. PMID:11003483

  8. High-NA HPCS optical fibers for medical diagnosis and treatment

    NASA Astrophysics Data System (ADS)

    Skutnik, Bolesh J.

    2010-02-01

    Hard Plastic Clad Silica (HPCS) optical fibers with pure silica cores have been developed which are robust and have NA(Numerical Aperture)>0.50. Improved clad only HPCS fibers have been produced for both new 'standard' and 'high' NA versions. Based on new cladding formulations, the 'standard' NA fiber has an NA of 0.41, while the new ultrahigh NA fiber has an NA of 0.54. Mechanical strength and preliminary fatigue data are presented along with spectral characterization data. For the first time significant results were obtained for clad only high NA fibers, The fibers are useful for diagnostic and surgical applications. Short to medium length time to failure results, indicate that the static fatigue parameters of the new high numerical aperture (NA) optical fibers are at least as good as those for former standard NA (0.37) HPCS fibers, which is an advance from previous results on the older formulation high NA fibers.

  9. The Na(+) transporter, TaHKT1;5-D, limits shoot Na(+) accumulation in bread wheat.

    PubMed

    Byrt, Caitlin Siobhan; Xu, Bo; Krishnan, Mahima; Lightfoot, Damien James; Athman, Asmini; Jacobs, Andrew Keith; Watson-Haigh, Nathan S; Plett, Darren; Munns, Rana; Tester, Mark; Gilliham, Matthew

    2014-11-01

    Bread wheat (Triticum aestivum L.) has a major salt tolerance locus, Kna1, responsible for the maintenance of a high cytosolic K(+) /Na(+) ratio in the leaves of salt stressed plants. The Kna1 locus encompasses a large DNA fragment, the distal 14% of chromosome 4DL. Limited recombination has been observed at this locus making it difficult to map genetically and identify the causal gene. Here, we decipher the function of TaHKT1;5-D, a candidate gene underlying the Kna1 locus. Transport studies using the heterologous expression systems Saccharomyces cerevisiae and Xenopus laevis oocytes indicated that TaHKT1;5-D is a Na(+) -selective transporter. Transient expression in Arabidopsis thaliana mesophyll protoplasts and in situ polymerase chain reaction indicated that TaHKT1;5-D is localised on the plasma membrane in the wheat root stele. RNA interference-induced silencing decreased the expression of TaHKT1;5-D in transgenic bread wheat lines which led to an increase in the Na(+) concentration in the leaves. This indicates that TaHKT1;5-D retrieves Na(+) from the xylem vessels in the root and has an important role in restricting the transport of Na(+) from the root to the leaves in bread wheat. Thus, TaHKT1;5-D confers the essential salinity tolerance mechanism in bread wheat associated with the Kna1 locus via shoot Na(+) exclusion and is critical in maintaining a high K(+) /Na(+) ratio in the leaves. These findings show there is potential to increase the salinity tolerance of bread wheat by manipulation of HKT1;5 genes. PMID:25158883

  10. Cytoplasmic Na+-dependent modulation of mitochondrial Ca2+ via electrogenic mitochondrial Na+–Ca2+ exchange

    PubMed Central

    Kim, Bongju; Matsuoka, Satoshi

    2008-01-01

    To clarify the role of mitochondrial Na+–Ca2+ exchange (NCXmito) in regulating mitochondrial Ca2+ (Ca2+mito) concentration at intact and depolarized mitochondrial membrane potential (??mito), we measured Ca2+mito and ??mito using fluorescence probes Rhod-2 and TMRE, respectively, in the permeabilized rat ventricular cells. Applying 300 nm cytoplasmic Ca2+ (Ca2+c) increased Ca2+mito and this increase was attenuated by cytoplasmic Na+ (Na+c) with an IC50 of 2.4 mm. To the contrary, when ??mito was depolarized by FCCP, a mitochondrial uncoupler, Na+c enhanced the Ca2+c-induced increase in Ca2+mito with an EC50 of about 4 mm. This increase was not significantly affected by ruthenium red or cyclosporin A. The inhibition of NCXmito by CGP-37157 further increased Ca2+mito when ??mito was intact, while it suppressed the Ca2+mito increase when ??mito was depolarized, suggesting that ??mito depolarization changed the exchange mode from forward to reverse. Furthermore, ??mito depolarization significantly reduced the Ca2+mito decrease via forward mode, and augmented the Ca2+mito increase via reverse mode. When the respiratory chain was attenuated, the induction of the reverse mode of NCXmito hyperpolarized ??mito, while ??mito depolarized upon inducing the forward mode of NCXmito. Both changes in ??mito were remarkably inhibited by CGP-37157. The above experimental data indicated that NCXmito is voltage dependent and electrogenic. This notion was supported theoretically by computer simulation studies with an NCXmito model constructed based on present and previous studies, presuming a consecutive and electrogenic Na+–Ca2+ exchange and a depolarization-induced increase in Na+ flux. It is concluded that Ca2+mito concentration is dynamically modulated by Na+c and ??mito via electrogenic NCXmito. PMID:18218682

  11. Effects of K+-deficient diets with and without NaCl supplementation on Na+, K+, and H2O transporters' abundance along the nephron.

    PubMed

    Nguyen, Mien T X; Yang, Li E; Fletcher, Nicholas K; Lee, Donna H; Kocinsky, Hetal; Bachmann, Sebastian; Delpire, Eric; McDonough, Alicia A

    2012-07-01

    Dietary potassium (K(+)) restriction and hypokalemia have been reported to change the abundance of most renal Na(+) and K(+) transporters and aquaporin-2 isoform, but results have not been consistent. The aim of this study was to reexamine Na(+), K(+) and H(2)O transporters' pool size regulation in response to removing K(+) from a diet containing 0.74% NaCl, as well as from a diet containing 2% NaCl (as found in American diets) to blunt reducing total diet electrolytes. Sprague-Dawley rats (n = 5-6) were fed for 6 days with one of these diets: 2% KCl, 0.74% NaCl (2K1Na, control chow) compared with 0.03% KCl, 0.74% NaCl (0K1Na); or 2% KCl, 2%NaCl (2K2Na) compared with 0.03% KCl, 2% NaCl (0K2Na, Na(+) replete). In both 0K1Na and 0K2Na there were significant decreases in: 1) plasma [K(+)] (<2.5 mM); 2) urinary K(+) excretion (<5% of control); 3) urine osmolality and plasma [aldosterone], as well as 4) an increase in urine volume and medullary hypertrophy. The 0K2Na group had the lowest [aldosterone] (172.0 ± 17.4 pg/ml) and lower blood pressure (93.2 ± 4.9 vs. 112.0 ± 3.1 mmHg in 2K2Na). Transporter pool size regulation was determined by quantitative immunoblotting of renal cortex and medulla homogenates. The only differences measured in both 0K1Na and 0K2Na groups were a 20-30% decrease in cortical ?-ENaC, 30-40% increases in kidney-specific Ste20/SPS1-related proline/alanine-rich kinase, and a 40% increase in medullary sodium pump abundance. The following proteins were not significantly changed in both the 0 K groups: Na(+)/H(+) exchanger isoform 3; Na(+)-K(+)-Cl(-) cotransporter; Na(+)-Cl(-) cotransporter, oxidative stress response kinase-1; renal outer medullary K(+) channel; autosomal recessive hypercholesterolemia; c-Src, aquaporin 2 isoform; or renin. Thus, despite profound hypokalemia and renal K(+) conservation, we did not confirm many of the changes that were previously reported. We predict that changes in transporter distribution and activity are likely more important for conserving K(+) than changes in total abundance. PMID:22496411

  12. EDITORIAL: TaCoNa-Photonics 2008 TaCoNa-Photonics 2008

    NASA Astrophysics Data System (ADS)

    Chigrin, Dmitry N.; Busch, Kurt; Lavrinenko, Andrei V.

    2009-11-01

    This special section on theoretical and computational nano-photonics features papers presented at the first International Workshop on Theoretical and Computational Nano-Photonics (TaCoNa-Photonics 2008) held in Bad Honnef, Germany, 3-5 December 2008. The workshop covered a broad range of topics related to current developments and achievements in this interdisciplinary area of research. Since the late 1960s, the word `photonics' has been understood as the science of generating, controlling, and detecting light. Nowadays, a routine fabrication of complex structures with micro- and nano-scale dimensions opens up many new and exciting possibilities in photonics. The science of generating, routing and detecting light in micro- and nano-structured matter, `nano-photonics', is becoming more important both in research and technology and offers many promising applications. The inherently sub-wavelength character of the structures that nano-photonics deals with challenges modern theoretical and computational physics and engineering with many nontrivial questions: Up to what length-scale can one use a macroscopic phenomenological description of matter? Where is the interface between the classical and quantum description of light in nano-scale structures? How can one combine different physical systems, different time- and length-scales in a single computational model? How can one engineer nano-structured materials in order to achieve the desired optical properties for particular applications? Any attempt at answering these kinds of questions is impossible without the joint efforts of physicists, engineers, applied mathematicians and programmers. This is the reason why the major goal of the TaCoNa-Photonics workshops is to provide a forum where theoreticians and specialists in numerical methods from all branches of physics, engineering sciences and mathematics can compare their results, report on novel results and breakthroughs, and discuss new challenges ahead. In order to intensify theoretical discussions and to put them on `solid' ground it was decided to invite world-leading experts in experimental photonics for plenary talks. Over three days, the workshop has brought together more than 70 specialists in theoretical and computational nano-photonics. The workshop took place in the historical `Physikzentrum Bad Honnef', whose unique atmosphere supported a multitude of highly interesting debates and discussions that often lasted until midnight and beyond. Different theoretical and numerical aspects of light generation, control and detection in general inhomogeneous media, photonic crystals, plasmonic structures, metamaterials and integrated optical systems were covered in 15 invited talks and 52 contributed oral and posters presentations. The plenary talks were given by Professor M Wegener (metamaterials) and Professor W Barnes (plasmonics). This special section is a cross-sectional selection of papers which were submitted by the authors of invited and contributed oral presentations. It also includes two papers of the winners of the Best Poster Awards. We hope that these papers will enhance the interest of the scientific community regarding nano-photonics in general and regarding the TaCoNa-Photonics workshop series in particular. It is our distinct pleasure to acknowledge the generous financial support of our sponsors: Karlsruhe School of Optics & Photonics (KSOP) (Germany), U.S. Army International Technology Center-Atlantic, Research Division (USA), and the Office of Naval Research Global (USA). Without the organizational assistance from the International Department of the Universität Karlsruhe GmbH (Germany) this event would simply have been impossible.

  13. Functional evidence for involvement of bumetanide-sensitive Na +K +2Cl ? cotransport in the hepatoportal Na + receptor of the Sprague–Dawley rat

    Microsoft Academic Search

    Hironobu Morita; Nobuhiro Fujiki; Masanobu Hagiike; Osamu Yamaguchi; Ken Lee

    1999-01-01

    To investigate mechanisms involved in hepatoportal Na+ sensing, responses of hepatic afferent nerve activity (HANA) to intraportal hypertonic NaCl injection were measured before, and after, intraportal infusion of inhibitors of Na+ transport systems. HANA increased in response to the intraportal injection of 0.75 M NaCl in a dose-dependent manner. The HANA response was not affected by amiloride or 4-acetamido-4?-isothiocyanato-stilbene-2,2?-disulfonic acid

  14. Energy metabolism, intracellular Na + and contractile function in isolated pig and rat hearts during cardioplegic ischemia and reperfusion: 23 Na and 31 P-NMR studies

    Microsoft Academic Search

    V. V. Kupriyanov; B. Xiang; K. W. Butler; M. St-Jean; R. Deslauriers

    1995-01-01

    The purpose of the study was to compare the role of Na ions in the damage caused by cardioplegic ischemia in fast (rat) and slow (pig) hearts. Changes in intracellular Na+ (Na+i), high energy phosphates, and contractile function were assessed during ischemia (36°C) and reperfusion in KCl-arrested perfused hearts using31P-NMR and shift reagent (DyTTHA3-)-aided23Na-NMR spectroscopy. In the pig hearts the

  15. Calculations of nonlinear optical responses of isomorphous crystals NaClO 3 and NaBrO 3 with natural optical activity

    Microsoft Academic Search

    Dongfeng Xue; Siyuan Zhang

    1998-01-01

    This work considers the isomorphous optically active crystals NaClO3 and NaBrO3. The connection between their second-order nonlinear optical (NLO) responses and chemical bond structures is established, starting from the experimental optical activities. The calculation reproduces the well-known experimental fact that crystals of NaClO3 and NaBrO3 with similar structures have different signs of optical rotation and of second harmonic generation (SHG).

  16. Expression cloning and cDNA sequencing of the Na+\\/glucose co-transporter

    Microsoft Academic Search

    Matthias A. Hediger; Michael J. Coady; Tyson S. Ikeda; Ernest M. Wright

    1987-01-01

    Organic substrates (sugars, amino acids, carboxylic acids and neutrotransmitters) are actively transported into eukaryotic cells by Na+ co-transport. Some of the transport proteins have been identified-for example, intestinal brush border Na+\\/glucose and Na+\\/proline transporters1,2 and the brain Na+\\/Cl-\\/GABA transporter3-and progress has been made in locating their active sites and probing their conformational states1,2,4-7. The archetypical Na+-driven transporter is the intestinal

  17. Simulation particulaire d'evenements rares P. Del Moral

    E-print Network

    Del Moral , Pierre

    Simulation particulaire d'´ev´enements rares P. Del Moral Centre INRIA de Bordeaux - Sud Ouest GT Projet AST&Risk Univ. Lyon, d´ecembre 2008 P. Del Moral (INRIA) INRIA Bordeaux-Sud Ouest 1 / 31 #12 des Cte de normalisation 4 Quelques r´ef´erences P. Del Moral (INRIA) INRIA Bordeaux-Sud Ouest 2 / 31

  18. Binding energy and structure of e{sup +}Na

    SciTech Connect

    Shertzer, J. [Department of Physics, College of the Holy Cross, Worcester, Massachusetts 01610 (United States); Ward, S. J. [Department of Physics, University of North Texas, Denton, Texas 76203 (United States)

    2010-06-15

    We calculate the nonadiabatic binding energy and geometry of the weakly bound state of e{sup +}Na. We use the Peach model potential, which includes both the dipole and an effective quadrupole term in the polarization, to describe the interaction of the electron and positron with the ion core. The effective three-body Schroedinger equation is solved with the finite element method. Because the model potential gives rise to three spurious states, the true ground state of e{sup +}Na is embedded in a dense spectrum of spurious states. We develop a method for extracting the correct ground state for e{sup +}Na, even when the energy is nearly degenerate with a spurious level. The calculated value for the binding energy is consistent with other calculations.

  19. Binding energy and structure of e+Na

    NASA Astrophysics Data System (ADS)

    Shertzer, J.; Ward, S. J.

    2010-06-01

    We calculate the nonadiabatic binding energy and geometry of the weakly bound state of e+Na. We use the Peach model potential, which includes both the dipole and an effective quadrupole term in the polarization, to describe the interaction of the electron and positron with the ion core. The effective three-body Schrödinger equation is solved with the finite element method. Because the model potential gives rise to three spurious states, the true ground state of e+Na is embedded in a dense spectrum of spurious states. We develop a method for extracting the correct ground state for e+Na, even when the energy is nearly degenerate with a spurious level. The calculated value for the binding energy is consistent with other calculations.

  20. NaCl as a retrospective and accident dosemeter.

    PubMed

    Ekendahl, Daniela; Judas, Libor

    2011-04-01

    NaCl is a cheap and widely available material. This study investigated the potential of NaCl in the form of a household salt as a retrospective and accident dosemeter using optically stimulated luminescence (OSL). Samples of the investigated household salt were stimulated using blue light of linearly modulated power. Attention was concentrated on sensitivity, dose dependence of the OSL signal, fading, optimisation of the read-out procedure and application of analytical protocols that do not require a specific calibration. A potential of NaCl as a complementary dosemeter within emergency preparedness was considered. The behaviour of the OSL signal observed was found to be favourable for dosimetry. PMID:21068016

  1. Theoretical simulation of the photoassociation process for NaCs

    NASA Astrophysics Data System (ADS)

    Zhang, Chang-Zhe; Zheng, Bin; Wang, Jun; Meng, Qing-Tian

    2013-02-01

    We investigate the two-step association process of NaCs using the time-dependent wave packet method. Ground state atoms can be photoassociated to the low vibrational levels of the ground state for an NaCs molecule by the two-step association. The time-dependent Schrödinger equation of the association process is solved within a three-state model and the wave packet is propagated with the “split operator-Fourier transform" scheme and the rotating-wave approximation (RWA). The vibrational population distribution of the ground state can be obtained by projecting the wave packet to every vibrational level of the ground state. The results not only show that for NaCs achievement of photoassociation production is accompanied by the photodissociation of the higher vibrational molecules, but also show that the vibrational distribution in lower vibrational levels of the ground state changes with the laser parameters.

  2. HARP and NA61 (SHINE) hadron production experiments

    SciTech Connect

    Popov, Boris A. [LPNHE, 4 place Jussieu, 75005, Paris and DLNP, JINR, Joliot-Curie 6, 141980, Dubna (Russian Federation)

    2009-11-25

    The hadroproduction experiments HARP and NA61 (SHINE) as well as their implications for neutrino physics are discussed. Recent HARP measurements have already been used for precise predictions of neutrino beams in K2K and MiniBooNE/SciBooNE experiments and are also being used to improve the atmospheric neutrino flux predictions and to help in the optimization of neutrino factory and super-beam designs. First preliminary data from NA61 are of significant importance for a precise prediction of a new neutrino beam at J-PARC to be used for the first stage of the T2K experiment. Both HARP and NA61 provide a large amount of input for validation and tuning of hadroproduction models in Monte-Carlo generators.

  3. Solvation of Na+, K+, and Their Dimers in Helium

    PubMed Central

    An der Lan, Lukas; Bartl, Peter; Leidlmair, Christian; Jochum, Roland; Denifl, Stephan; Echt, Olof; Scheier, Paul

    2012-01-01

    Helium atoms bind strongly to alkali cations which, when embedded in liquid helium, form so-called snowballs. Calculations suggest that helium atoms in the first solvation layer of these snowballs form rigid structures and that their number (n) is well defined, especially for the lighter alkalis. However, experiments have so far failed to accurately determine values of n. We present high-resolution mass spectra of Na+Hen, K+Hen, Na2+Hen and K2+Hen, formed by electron ionization of doped helium droplets; the data allow for a critical comparison with several theoretical studies. For sodium and potassium monomers the spectra indicate that the value of n is slightly smaller than calculated. Na2+Hen displays two distinct anomalies at n=2 and n=6, in agreement with theory; dissociation energies derived from experiment closely track theoretical values. K2+Hen distributions are fairly featureless, which also agrees with predictions. PMID:22374575

  4. The stability of sodalite in the system NaAlSiO sub 4 -NaCl

    SciTech Connect

    Sharp, Z.D. (Carnegie Institution of Washington, DC (USA)); Helffrich, G.R. (Northwestern Univ., Evanston, IL (USA)); Bohlen, S.R. (S.U.N.Y., Stony Brook, NY (USA)); Essene, E.J. (Univ. of Michigan, Ann Arbor (USA))

    1989-08-01

    The reaction sodalite = {beta}-nepheline + NaCl (s) was reversed in solid-medium apparatus and the reaction sodalite = carnegieite + NaCl (l) was reversed at 1 bar (1,649-1,652 K). The experimental reversals between 923 K and 973 K can be fit with a dP/dT of {minus}11 bar/K, suggesting that the excess entropy for sodalite is present only above 923 K. A phase diagram for the NaAlSiO{sub 4}-NaCl system that is consistent with the measured thermochemical data and the experiments between 973 and 1,650 K can be generated if the 61.7 J/mol{center dot}K entropy contribution is included in the S{sup 0}{sub 298} of sodalite. This entropy contribution must be removed below 973 K for the experiments to fit with calculations. Previously unreported thermodynamic data estimated in this study are {Delta}G{sup 0}{sub 298} for sodalite ({minus}12,697 kJ/mol) and carnegieite (NaAlSiO{sub 4}) ({minus}1,958 kJ/mol), S{sup 0}{sub 298} of carnegieite (129.6 J/mol{center dot}K) and compressibility of NaCl{sub liquid} (V{sup P}{sub 298} (cm{sup 3}) = 31.6{center dot}(1 - 24.7{center dot}10{sup {minus}3}{center dot}P + 800{center dot}10{sup {minus}6}{center dot}P{sup 2}))(T in K; P in kbar). Sodalite is a high-temperature, low-pressure phase, stable well above the solidus in sodic silica-undersaturated magmas enriched in NaCl, and its presence constrains NaCl activities in magmas. Estimates of minimum NaCl (l) activities in the Mont St-Hilaire sodalite syenites are 0.05 at 1,073 K and 0.13 at 1,273 K. Density calculations are consistent with the field observations that sodalite phenocrysts will float in a nepheline syenite liquid. This explains the enrichment of sodalite in the upper levels of the sodalite syenites at Mont St.Hilaire and elsewhere.

  5. The voltage-gated Na+ channel NaVBP has a role in motility, chemotaxis, and pH homeostasis of an alkaliphilic Bacillus

    PubMed Central

    Ito, Masahiro; Xu, Haoxing; Guffanti, Arthur A.; Wei, Yi; Zvi, Lior; Clapham, David E.; Krulwich, Terry A.

    2004-01-01

    The prokaryotic voltage-gated Na+ channel, NaChBac, is one of a growing channel superfamily of unknown function. Here we show that NaVBP, the NaChBac homologue encoded by ncbA in alkaliphilic Bacillus pseudofirmus OF4, is a voltage-gated Na+ channel potentiated by alkaline pH. NaVBP has roles in motility, chemotaxis, and pH homeostasis at high pH. Reduced motility of bacteria lacking functional NaVBP was reversed by restoration of the native channel but not by a mutant NaVBP engineered to be Ca2+-selective. Motile ncbA mutant cells and wild-type cells treated with a channel inhibitor exhibited behavior opposite to the wild type in response to chemoeffectors. Mutants lacking functional NaVBP were also defective in pH homeostasis in response to a sudden alkaline shift in external pH under conditions in which cytoplasmic [Na+] is limiting for this crucial process. The defect was exacerbated by mutation of motPS, the motility channel genes. We hypothesize that activation of NaVBP at high pH supports diverse physiological processes by a combination of direct and indirect effects on the Na+ cycle and the chemotaxis system. PMID:15243157

  6. Shoot Na+ Exclusion and Increased Salinity Tolerance Engineered by Cell Type–Specific Alteration of Na+ Transport in Arabidopsis[W][OA

    PubMed Central

    Møller, Inge S.; Gilliham, Matthew; Jha, Deepa; Mayo, Gwenda M.; Roy, Stuart J.; Coates, Juliet C.; Haseloff, Jim; Tester, Mark

    2009-01-01

    Soil salinity affects large areas of cultivated land, causing significant reductions in crop yield globally. The Na+ toxicity of many crop plants is correlated with overaccumulation of Na+ in the shoot. We have previously suggested that the engineering of Na+ exclusion from the shoot could be achieved through an alteration of plasma membrane Na+ transport processes in the root, if these alterations were cell type specific. Here, it is shown that expression of the Na+ transporter HKT1;1 in the mature root stele of Arabidopsis thaliana decreases Na+ accumulation in the shoot by 37 to 64%. The expression of HKT1;1 specifically in the mature root stele is achieved using an enhancer trap expression system for specific and strong overexpression. The effect in the shoot is caused by the increased influx, mediated by HKT1;1, of Na+ into stelar root cells, which is demonstrated in planta and leads to a reduction of root-to-shoot transfer of Na+. Plants with reduced shoot Na+ also have increased salinity tolerance. By contrast, plants constitutively expressing HKT1;1 driven by the cauliflower mosaic virus 35S promoter accumulated high shoot Na+ and grew poorly. Our results demonstrate that the modification of a specific Na+ transport process in specific cell types can reduce shoot Na+ accumulation, an important component of salinity tolerance of many higher plants. PMID:19584143

  7. Quaternary Organic Amines Inhibit Na,K Pump Current in a Voltage-dependent Manner: Direct Evidence of an Extracellular Access Channel in the Na,K-ATPase

    Microsoft Academic Search

    R. Daniel Peluffo; Yukio Hara; Joshua R. Berlin

    2004-01-01

    The effects of organic quaternary amines, tetraethylammonium (TEA) chloride and benzyltrieth- ylammonium (BTEA) chloride, on Na,K pump current were examined in rat cardiac myocytes superfused in ex- tracellular Na ? -free solutions and whole-cell voltage-clamped with patch electrodes containing a high Na ? -salt so- lution. Extracellular application of these quaternary amines competitively inhibited extracellular K ? (Ko ) activa-

  8. O IMPACTO DA ARMAZENAGEM DA SOJA NA PROPRIEDADE RURAL SOBRE OS PREÇOS DE MERCADO DA COMMODITY E NA AMPLIAÇÃO DA CAPACIDADE DE ARMAZENAMENTO

    Microsoft Academic Search

    Lenio Tramontina; Edson Talamini; Gabriel Murad Velloso Ferreira

    2008-01-01

    O presente trabalho consiste em um estudo realizado com objetivo principal de avaliar o impacto do aumento na capacidade de armazenagem de soja na propriedade rural, sobre o nível de preços da commodity e deste sobre a viabilidade de novos incrementos na capacidade de armazenagem. Para o seu desenvolvimento aplicou-se um estudo exploratório, baseado no levantamento e análise de dados

  9. Rechargeable sodium batteries; NaFeO sub 2 and FeOCl as positive electrodes in molten NaAlCl sub 4

    SciTech Connect

    Abraham, K.M.; Pasquariello, D.M. (EIC Labs., Inc., Norwood, MA (USA))

    1990-04-01

    The authors have conducted studies in which they found that NaFeO{sub 2} and FeOCl behave as highly reversible positive electrodes in conjunction with molten NaAlCl{sub 4} in Na cells operating at {approximately} 180{degrees}C. Results of the studies are discussed.

  10. RELACIÓN MÉDICO PACIENTE: DERECHOS DEL ADULTO MAYOR

    PubMed Central

    Barrantes-Monge, Melba; Rodríguez, Eduardo; Lama, Alexis

    2009-01-01

    Existen prejuicios en relación con la vejez, incluso entre los profesionales que se dedican a la gerontología. Uno común y peligroso es considerar que los viejos son todos enfermos o discapacitados. La relación médico-paciente es la piedra angular de la práctica y ética médicas. Para alcanzar el respeto por los adultos mayores es necesaria una medicina prudente, basada en una práctica en la cual la reflexión ética y clínica pueda contribuir. Esto último es posible si se hacen valer los derechos del adulto mayor, en particular como paciente para la toma de decisiones. PMID:20379380

  11. Measurement of low-energy Na^+ -- Na total collision rate in an ion--neutral hybrid trap

    E-print Network

    Goodman, D S; Kwolek, J M; Blümel, R; Narducci, F A; Smith, W W

    2014-01-01

    We present measurements of the total elastic and resonant charge-exchange ion-atom collision rate coefficient $k_\\mathrm{ia}$ of cold sodium (\\ce{Na}) with optically-dark low energy \\ce{Na+} ions in a hybrid ion-neutral trap. To determine $k_\\mathrm{ia}$, we measured the trap loading and loss from both a \\ce{Na} magneto-optical trap (MOT) and a linear radio frequency quadrupole Paul trap. We found the total rate coefficient to be $7.4 \\pm 1.9 \\times 10^{-8}$ cm$^3$/s for the type I \\ce{Na} MOT immersed within an $\\approx 140$ K ion cloud and $1.10 \\pm 0.25 \\times 10^{-7}$ cm$^3$/s for the type II \\ce{Na} MOT within an $\\approx 1070$ K ion cloud. Our measurements show excellent agreement with previously reported theoretical fully quantal \\textit{ab initio} calculations. In the process of determining the total rate coefficient, we demonstrate that a MOT can be used to probe an optically dark ion cloud's spatial distribution within a hybrid trap.

  12. COMUNICATO STAMPA Tariffe trasporto pubblico: dichiarazione del rettore Tommasetti

    E-print Network

    Costagliola, Gennaro

    COMUNICATO STAMPA Tariffe trasporto pubblico: dichiarazione del rettore Tommasetti Il Magnifico Regione Campania, delle tariffe riguardanti il trasporto pubblico che tanta preoccupazione avevano destato

  13. GENERAL TECHNICAL REPORT PSW-GTR-245 Manejando los Riesgos del Manejo del

    E-print Network

    Standiford, Richard B.

    explícitamente en el proceso de toma de decisiones de los gerentes de incendios daría lugar, con suerte, a un reconocimiento e internalización de estos factores en sus decisiones. Palabras clave: Riesgo profesional, toma de). En esencia, la gestión del riesgo es un problema en la toma de decisiones basada en el riesgo, y el

  14. Universidad Simn Bolvar Programa auror@ para la Gestin delPrograma auror@ para la Gestin del

    E-print Network

    Vásquez, Carlos

    No existe un PGDE que contribuya a agilizar el flujo documental que sustenta los procesos administrativos Institución. #12;Pl t i t d l Pr blPlanteamiento del Problema Procesos administrativos repetitivos y pocop y p de los resultados. Listado de procesos administrativos ap inc

  15. IMPLICACIONES DEL MODELO DE ENSEÑANZA NATURAL DEL LENGUAJE EN LA INTERVENCION DE PERSONAS CON AUTISMO

    Microsoft Academic Search

    Pedro Gortázar

    Equipo CEPRI RESUMEN: El Modelo de Tratamiento Natural del Lenguaje constituye el para- digma de intervención actualmente más válido para hacer frente a los déficits sociales y comunicativos de las personas con autismo. En esta ponencia se discuten las implicaciones de este Modelo de cara a la formu- lación de objetivos curriculares, definición de criterios de respuesta, técnicas de entre-

  16. La aplicación del modelo del estado completo de salud al estudio de la depresión

    Microsoft Academic Search

    Darío Díaz; Amalio Blanco; Javier Horcajo; Carmen Valle

    2007-01-01

    La definición de salud propuesta por la OMS señala que ésta no consiste sólo en la ausencia de enfer- medad, sino también en la presencia de un estado de completo bienestar físico, mental y social. Para concretar en qué consiste este estado positivo, el Modelo del Estado Completo de Salud (MECS) ha definido la salud mental como un conjunto de

  17. GESTIÓN DEL TURISMO DESDE LA PERSPECTIVA DEL BILINGÜISMO Y LA MULTICULTURALIDAD: CASO CIUDAD JUÁREZ

    Microsoft Academic Search

    Tomás J. Cuevas-Contreras; Ercilia Loera Anchondo; Brenda N. Vázquez García

    2010-01-01

    La Organización Mundial del Turismo, (agencia perteneciente a la ONU) refiere que, “el turismo comprende las actividades que realizan las personas durante sus viajes y estancias en lugares distintos a su entorno habitual, por un periodo de tiempo consecutivo inferior a un año, con fines de ocio, por negocios y otros” (OMT, 2006) En base a este concepto y al

  18. Integración del aprendizaje individual y del colaborativo en un sistema hipermedia adaptativo

    Microsoft Academic Search

    Carlos Arteaga; Ramón Fabregat

    2002-01-01

    Resumen— En este artículo se define un Sistema Hipermedia de Aprendizaje Colaborativo Adaptativo (SHACA) en el que se relaciona el Aprendizaje Individual y el Aprendizaje Colaborativo a través de un Modelo Adaptativo. El Modelo Adaptativo permite al Ambiente de Aprendizaje adaptar su comportamiento al estudiante tanto cuando interactúa sólo, como cuando está involucrado en tareas colaborativas. La arquitectura del sistema

  19. Trombosis del seno sagital cerebral: causa infrecuente de cefalea del postparto: a propósito de un caso

    Microsoft Academic Search

    M. Madrazo Delgado; F. J. Redondo Calvo; S. Gil Trujillo; J. L. Castillo; M. Calvo García; G. Bernal García

    2008-01-01

    a Servicio de Radiodiagnóstico. Hospital General de Ciudad Real. Resumen Las trombosis venosas cerebrales del postparto son una entidad muy poco frecuente (3-4 casos por millón). Sus manifestaciones clínicas son variadas, siendo la cefa- lea persistente casi una constante, lo que implica hacer un diagnóstico diferencial con otras causas de cefalea durante el puerperio. Los factores predisponentes reco- nocidos de

  20. Una medición del impacto del Programa de Capacitación Laboral Juvenil PROJoven

    Microsoft Academic Search

    Hugo Ñopo; Miguel Robles; Jaime Saavedra

    2002-01-01

    El presente documento presenta una medición de impacto del programa de capacitación laboral juvenil PROJoven. Se utilizó información socio-laboral de una muestra de beneficiarios y un conjunto de individuos que conformaron el grupo de control. Esta información fue recogida antes de iniciados los cursos de capacitación de la sexta convocatoria (línea de base) y después de seis meses de concluido

  1. Efecto del Programa de Entrenamiento “Manejo del Dolor” en la Documentación de Enfermería en el Expediente Electrónico

    PubMed Central

    Monsiváis, María Guadalupe Moreno; Guzmán, Ma. Guadalupe Interial; Flores, Paz Francisco Sauceda; Arreola, Leticia Vázquez

    2012-01-01

    Resumen En el presente trabajo se muestra la importancia de entrenar al personal de enfermería para mejorar la documentación en el expediente electrónico. Se eligió el manejo del dolor por ser un área prioritaria; una alta proporción de pacientes en período post operatorio cursa con dolor, por lo tanto, la documentación debe ser útil para la toma de decisiones clínicas. Se implementó un programa de entrenamiento denominado “Manejo del Dolor” dirigido al personal de enfermería. Se utilizó la tecnología de la información como herramienta para fortalecer el conocimiento con base en la revisión sistemática de la literatura; el personal de enfermería participante seleccionó la mejor evidencia; posteriormente se trabajó en la transferencia de este conocimiento a la práctica a través del diseño de un protocolo para el manejo del dolor. Se concluye que el conocimiento del manejo del dolor es fundamental para que enfermería documente con mayor precisión sus intervenciones. PMID:24199106

  2. Brain Na+, K+-ATPase Activity In Aging and Disease

    PubMed Central

    de Lores Arnaiz, Georgina Rodríguez; Ordieres, María Graciela López

    2014-01-01

    Na+/K+ pump or sodium- and potassium-activated adenosine 5’-triphosphatase (Na+, K+-ATPase), its enzymatic version, is a crucial protein responsible for the electrochemical gradient across the cell membranes. It is an ion transporter, which in addition to exchange cations, is the ligand for cardenolides. This enzyme regulates the entry of K+ with the exit of Na+ from cells, being the responsible for Na+/K+ equilibrium maintenance through neuronal membranes. This transport system couples the hydrolysis of one molecule of ATP to exchange three sodium ions for two potassium ions, thus maintaining the normal gradient of these cations in animal cells. Oxidative metabolism is very active in brain, where large amounts of chemical energy as ATP molecules are consumed, mostly required for the maintenance of the ionic gradients that underlie resting and action potentials which are involved in nerve impulse propagation, neurotransmitter release and cation homeostasis. Protein phosphorylation is a key process in biological regulation. At nervous system level, protein phosphorylation is the major molecular mechanism through which the function of neural proteins is modulted in response to extracellular signals, including the response to neurotransmitter stimuli. It is the major mechanism of neural plasticity, including memory processing. The phosphorylation of Na+, K+-ATPase catalytic subunit inhibits enzyme activity whereas the inhibition of protein kinase C restores the enzyme activity. The dephosphorylation of neuronal Na+, K+-ATPase is mediated by calcineurin, a serine / threonine phosphatase. The latter enzyme is involved in a wide range of cellular responses to Ca2+ mobilizing signals, in the regulation of neuronal excitability by controlling the activity of ion channels, in the release of neurotransmitters and hormones, as well as in synaptic plasticity and gene transcription. In the present article evidence showing Na+, K+-ATPase involvement in signaling pathways, enzyme changes in diverse neurological diseases as well as during aging, have been summarized. Issues refer mainly to Na+, K+-ATPase studies in ischemia, brain injury, depression and mood disorders, mania, stress, Alzheimer´s disease, learning and memory, and neuronal hyperexcitability and epilepsy. PMID:25018677

  3. Possible selective adsorption of enantiomers by Na-montmorillonite

    NASA Technical Reports Server (NTRS)

    Friebele, E.; Shimoyama, A.; Ponnamperuma, C.

    1981-01-01

    Racemic amino acids including (D,L) alpha-alamine, (D,L) alpha-aminobutyric acid, (D,L) valine, and (D,L) norvaline were incubated with Na-montmorillonite at 100% CEC at three hydrogen ion concentrations, and amino acid adsorption was determined by ion exchange chromatography. Enantiomers were analyzed by gas chromatography. Differences in the quantities of D and L enantiomers in any of the fractions was no larger than a few percent. Although a large difference in the adsorption of the amino acid enantiomers was not observed, the analysis may indicate a small preferential adsorption (0.5-2%) of L-amino acids by Na-montmorillonite.

  4. Olivine-type NaCd(AsO4)

    PubMed Central

    Weil, Matthias

    2013-01-01

    The title compound, sodium cadmium orthoarsenate, adopts the olivine [Mg2(SiO4)] structure type in space group Pnma, with Na (site symmetry -1) and Cd (.m.) replacing the two Mg positions, and the AsO4 tetra­hedron (.m.) the SiO4 tetra­hedron. The crystal structure is made up of a nearly hexa­gonal closed-packed arrangement of O atoms stacked along [001]. The Na and Cd atoms occupy one half of the octa­hedral voids in alternate layers stacked along [100], and one eighth of the tetra­hedral voids are occupied by As atoms. PMID:24454011

  5. Aprovaci de l'assignaci de complements bsics de recerca del PDI-F (sexennis CNEAI)

    E-print Network

    Yannuzzi Sanchez, Marcelo

    Aprovació de l'assignació de complements bàsics de recerca del PDI-F (sexennis CNEAI) Acord núm.152/2014 del Consell de Govern pel qual s'aprova l'assignació de complements bàsics de recerca del PDI Politècnica de Catalunya, es resol la convocatòria 2013 del complement bàsic de recerca del PDI funcionari

  6. In Situ SAXS/WAXS of Zeolite Microwave Synthesis: NaY, NaA, and Beta Zeolites

    SciTech Connect

    Panzarella,B.; Tompsett, G.; Conner, W.; Jones, K.

    2007-01-01

    A custom waveguide apparatus is constructed to study the microwave synthesis of zeolites by in situ small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS). The WR-284 waveguide is used to heat precursor solutions using microwaves at a frequency of 2.45 GHz. The reaction vessels are designed to include sections of thin-walled glass, which permit X-rays to pass through the precursor solutions with minimal attenuation. Slots were machined into the waveguide to provide windows for X-ray energy to enter and scatter from solutions during microwave heating. The synthesis of zeolites with conventional heating is also studied using X-ray scattering in the same reactor. SAXS studies show that the crystallization of beta zeolite and NaY zeolite is preceded by a reorganization of nanosized particles in their precursor solutions or gels. The evolution of these particles during the nucleation and crystallization stages of zeolite formation depends on the properties of the precursor solution. The synthesis of NaA and NaX zeolites and sodalite from a single zeolite precursor is studied by microwave and conventional heating. Microwave heating shifts the selectivity of this synthesis in favor of NaA and NaX over sodalite; conventional heating leads to the formation of sodalite for synthesis from the same precursor. The use of microwave heating also led to a more rapid onset of NaA zeolite product crystallization compared to conventional heating. Pulsed and continuous microwave heating are compared for zeolite synthesis. The resulting rates of formation of the zeolite products, and the relative amounts of the products determined from the WAXS spectra, are similar when either pulsed or continuous microwave heating is applied in the reactor while maintaining the same synthesis temperature. The consequences of these results in terms of zeolite synthesis are discussed.

  7. Development of illumination optics and projection optics for high-NA EUV exposure tool (HiNA)

    NASA Astrophysics Data System (ADS)

    Oshino, Tetsuya; Shiraishi, Masayuki; Kandaka, Noriaki; Sugisaki, Katsumi; Kondo, Hiroyuki; Ota, Kazuya; Mashima, K.; Murakami, Katsuhiko; Oizumi, Hiroaki; Nishiyama, Iwao; Okazaki, Shinji

    2003-06-01

    We have developed a high numerical aperture (NA) small-field exposure system (HiNA) for EUV exposure process development. NA of projection optics of EUV exposure tools for 45-nm node lithography is expected to be around 0.25, which is higher than that previously expected (0.1). HiNA has compatible illumination system, which can be switched to partial coherent illumination and coherent illumination by changing some optical elements. Coherent illumination system was prepared for a high contrast imaging but the uniformity of intensity is less than that of partial coherent illumination. A reflected-type fly*fs-eye element was adopted for partial coherent illumination, which can provide uniformity of both coherency and intensity simultaneously. The coherency of the partial coherent illumination is 0.8. HiNA projection optics consists of two aspheric mirrors, with the NA and the imaging field of 0.3 and 0.3×0.5mm2, respectively. We fabricated two sets of projection-optics. Although the wavefront error of set-1 optics was 7nmRMS, that of set-2 optics was improved to 1.9nmRMS, which was measured with a point diffraction interferometer (PDI) using He-Ne laser. The wavefront error of the set-2 optics was improved by using a new mirror mount mechanism. The mount system consists of several board springs made of super invar in order to minimize the deformation of mirrors by mounting stress. The projection optics of the set-2 has a remote controlled mirror adjustment mechanism which has five degrees of freedom (X,Y,Z,X-Tilt and Y-Tilt). The position of the concave secondary mirror was adjusted precisely with measuring the wavefront error using PDI.

  8. Aprovaci del canvi de pla d'estudis del grau en Recursos energtics i Acord nm. 163/2014 del Consell de Govern pel qual s'aprova el canvi de

    E-print Network

    Yannuzzi Sanchez, Marcelo

    Aprovació del canvi de pla d'estudis del grau en Recursos energètics i miners Acord núm. 163/2014 del Consell de Govern pel qual s'aprova el canvi de pla d'estudis del grau en Recursos energètics i mantenir l'entrada comuna per totes les titulacions, s'ha de modificar el pla d'estudis del Grau en

  9. Laser vaporized Li2, Na2, K2, and LiNa molecules observed by cavity ring-down spectroscopy

    NASA Astrophysics Data System (ADS)

    Labazan, I.; Miloševi?, S.

    2003-09-01

    Laser ablation of solid lithium, sodium, potassium, and lithium-sodium alloy was performed using a 308-nm excimer laser at fluences close to 1 J cm-2. Frequency and time resolved A-X and B-X electronic transitions of 6,7Li2, Na2, LiNa and K2 respectively, were observed. Lithium atom, dimer velocities, and influence of the background gas on dimer content of the plume have been measured. The origin of dimers at high densities, with subthermal internal energy, is discussed.

  10. Spin assignments to excited states in 22Na through a 24Mg(p,3He)22Na reaction measurement

    SciTech Connect

    Chae, K. Y. [University of Tennessee; Bardayan, Daniel W [ORNL; Blackmon, Jeff C [ORNL; Chipps, K. [Colorado School of Mines, Golden; Hatarik, Robert [Rutgers University; Jones, K. L. [University of Tennessee; Kozub, R. L. [Tennessee Technological University; Liang, J Felix [ORNL; Matei, Catalin [Oak Ridge Associated Universities (ORAU); Moazen, Brian [University of Tennessee; Nesaraja, Caroline D [ORNL; O'Malley, Patrick [Rutgers University; Pain, S. D. [Rutgers University; Pittman, S. T. [University of Tennessee, Knoxville (UTK); Smith, Michael Scott [ORNL

    2010-10-01

    The level structure of 22Na has been studied at the Holifield Radioactive Ion Beam Facility in Oak Ridge National Laboratory using the 24Mg(p,3He)22Na reaction. 41 and 41.5 MeV proton beams were generated by 25 MV tandem accelerator and bombarded isotopically enriched 24Mg targets. Angular distributions of recoiling 3He particles were extracted by using a segmented annular silicon strip detector array. Spins and parities for ten levels were constrained through a distorted wave Born approximation analysis of angular distributions including three above the proton threshold at 6.739 MeV.

  11. O, Na, Ba and Eu abundance patterns in open clusters

    NASA Astrophysics Data System (ADS)

    MacLean, B. T.; De Silva, G. M.; Lattanzio, J.

    2015-02-01

    Open clusters are historically regarded as single-aged stellar populations representative of star formation within the Galactic disc. Recent literature has questioned this view, based on discrepant Na abundances relative to the field, and concerns about the longevity of bound clusters contributing to a selection bias: perhaps long-lived open clusters are chemically different to the star formation events that contributed to the Galactic disc. We explore a large sample of high-resolution Na, O, Ba and Eu abundances from the literature, homogenized as much as reasonable including accounting for non-local thermodynamic equilibrium (NLTE) effects, variations in analysis and choice of spectral lines. Compared to a template globular cluster and representative field stars, we find no significant abundance trends, confirming that the process producing the Na-O anticorrelation in globular clusters is not present in open clusters. Furthermore, previously reported Na enhancement of open clusters is found to be an artefact of NLTE effects, with the open clusters matching a subset of chemically tagged field stars.

  12. Stainless Steel NaK Circuit Integration and Fill Submission

    NASA Technical Reports Server (NTRS)

    Garber, Anne E.

    2006-01-01

    The Early Flight Fission Test Facilities (EFF-TF) team has been tasked by the Marshall Space Flight Center Nuclear Systems Office to design, fabricate, and test an actively pumped alkali metal flow circuit. The system, which was originally designed to hold a eutectic mixture of sodium potassium (NaK), was redesigned to hold lithium; but due to a shift in focus, it is once again being prepared for use with NaK. Changes made to the actively pumped, high temperature loop include the replacement of the expansion reservoir, addition of remotely operated valves, and modification of the support table. Basic circuit components include: reactor segment, NaK to gas heat exchanger, electromagnetic (EM) liquid metal pump, load/drain reservoir, expansion reservoir, instrumentation, and a spill reservoir. A 37-pin partial-array core (pin and flow path dimensions are the same as those in a full design) was selected for fabrication and test. This document summarizes the integration and fill of the pumped liquid metal NaK flow circuit.

  13. POLMEROS EM SUPERFCIES Polmeros adsorvidos na superfcies de partculas

    E-print Network

    Loh, Watson

    POLÍMEROS EM SUPERFÍCIES Polímeros adsorvidos na superfícies de partículas coloidais Polímeros em interfaces líquidas Polímeros em interfaces sólidas #12;Polímeros em solução - Teoria de Flory-Hugghins #12;Polímeros em solução - Teoria de Flory-Hugghins Gm = kT(1ln1 + 2/N ln2 + 12) 1 = solvente 2 = polímero (Gm

  14. Characteristics optimization of mask materials for hyper-NA lithography

    Microsoft Academic Search

    Yasutaka Morikawa; Takanori Suto; Takaharu Nagai; Yuichi Inazuki; Takashi Adachi; Yasuhisa Kitahata; Toshifumi Yokoyama; Nobuhito Toyama; Hiroshi Mohri; Naoya Hayashi

    2007-01-01

    Hyper-NA lithography with polarized light illumination is introduced as the solution of 45nm or 32nm node technology. In that case, consideration of new characteristics of masks and substrates has been required. Mainly, following three materials, quartz substrates, absorber or phase shifter materials and pellicle films, have been discussed for that issue. Item to be discussed on quartz substrates is birefringence.

  15. Catadioptric projection lens for 1.3 NA scanner

    NASA Astrophysics Data System (ADS)

    Matsuyama, Tomoyuki; Ohmura, Yasuhiro; Fujishima, Yohei; Koyama, Takashi

    2007-03-01

    In the history of DUV (Deep Ultra Violet) microlithographic lens design, three kinds of leaps have occurred to maintain the progress of technology in the semiconductor industry. The first step is the application of aspherical elements. This allowed us to increase NA up to around 0.9. The second innovation is water immersion. Thanks to the 1.44 refractive index of water, and because the numerical aperture (NA) is defined as the product of the sine of the maximum ray angle on the image plane and the refractive index in the image space, even with a lower maximum ray angle on the imaging plane than dry with a lens, we can achieve NA of 1.07. The latest technological jump is the development of catadioptric lens systems, which are roughly defined as the combined usage of refractive element(s) and reflective element(s). The catadioptric system allows us to achieve a full field 1.3NA projection lens that is used in our scanner NSR-S610C. In this paper we discuss optical design concepts and some challenges for catadioptric lenses. In addition, current lens performance including wavefront, lens flare, and image vibration are shown.

  16. NaK release model for MASTER-2009

    NASA Astrophysics Data System (ADS)

    Wiedemann, Carsten; Flegel, Sven; Gelhaus, Johannes; Krag, Holger; Klinkrad, Heiner; Vörsmann, Peter

    2011-04-01

    Sodium-potassium droplets from the primary coolant loop of Russian orbital reactors have been released into space. These droplets are called NaK droplets. Sixteen nuclear powered satellites of the type RORSAT launched between 1980 and 1988 activated a reactor core ejection system, mostly between 900 and 950 km altitude. The core ejection causes an opening of the primary coolant loop. The liquid coolant consists of eutectic sodium-potassium alloy and has been released into space during these core ejections. The NaK coolant has been forming droplets up to a diameter of 5.5 cm. NaK droplets have been modeled before in ESA's MASTER Debris and Meteoroid Environment Model. The approach is currently revised for the MASTER-2009 upgrade. A mathematical improvement is introduced by substituting the current size distribution function by the modified Rosin-Rammler equation. A bimodal size distribution is derived which is based on the modified mass based Rosin-Rammler equation. The equation is modified by truncating the size range and normalizing over the finite range between the size limits of the smallest and the biggest droplet. The parameters of the model are introduced and discussed. For the validation of the NaK release model, sixteen release events are simulated. The resulting size distribution is compared with radar measurement data. The size distribution model fits well with revised published measurement data of radar observations. Results of orbit propagation simulation runs are presented in terms of spatial density.

  17. Grant Title: STARR FOUNDATION Funding Opportunity Number: N/A

    E-print Network

    Farritor, Shane

    Grant Title: STARR FOUNDATION Funding Opportunity Number: N/A Agency/Department: Starr Foundation Grants Program. Area of Research: The foundation makes grants in the following areas: education, medicine and post-secondary schools. Grants for medicine and health care include capital grants to hospitals

  18. Grant Title: CORNING FOUNDATION Funding Opportunity Number: N/A

    E-print Network

    Farritor, Shane

    Grant Title: CORNING FOUNDATION Funding Opportunity Number: N/A Agency/Department: Corning: The Corning Incorporated Foundation develops and administers projects in support of educational, cultural which improve the quality of life in and near communities where Corning Incorporated is an active

  19. Results from NA60 experiment at the CERN SPS

    SciTech Connect

    Usai, G.; Cicalo, C.; De Falco, A.; Floris, M.; Masoni, A.; Puddu, G.; Serci, S. [Univ. di Cagliari, Cagliari (Italy); INFN, Cagliari (Italy); Arnaldi, R.; Colla, A.; Cortese, P.; Ferretti, A.; Oppedisano, C. [Univ. di Torino (Italy) and INFN (Italy); Averbeck, R.; Drees, A. [SUNY Stony Brook, New York (United States); Banicz, K. [CERN, Geneva (Switzerland); Univ. Heidelberg, Heidelberg (Germany); Castor, J.; Devaux, A.; Force, P.; Manso, F. [LPC, Univ. Blaise Pascal, Clermont-Ferrand (France); CNRS-IN2P3, Clermont-Ferrand (France); Chaurand, B. [LLR, Ecole Polytechnique, Palaiseau (France); CNRS-IN2P3, Palaiseau (France)] (and others)

    2006-07-11

    The NA60 experiment studies open charm and prompt dimuon production in proton-nucleus and nucleus-nucleus collisions at the CERN SPS. During 2003 the experiment collected data in Indium-Indium collisions at 158 GeV per nucleon. In this paper the first results on low mass dimuons, intermediate mass dimuons and J/{psi} suppression are presented.

  20. Electronic structure and molecular dynamics of Na2Li

    Microsoft Academic Search

    Nathaniel O. J. Malcolm; Joseph J. W. McDouall

    1997-01-01

    Following the first report (Mile, B., Sillman, P. D., Yacob, A. R. and Howard, J. A., 1996, J. chem. Soc. Dalton Trans , 653) of the EPR spectrum of the mixed alkali-metal trimer Na2Li a detailed study has been made of the electronic structure and structural dynamics of this species. Two isomeric forms have been found: one of the type,

  1. Formation of oriented membrane multilayers of Na/K-ATPase

    SciTech Connect

    Pachence, J.M.; Knott, R.; Edelman, I.S.; Schoenborn, B.P.; Wallace, B.A.

    1982-01-01

    The isolated membrane-bound enzyme retains its ouabain-sensitive ATP hydrolysis activity, and produces ATP-dependent Na/sup +/ and K/sup +/ fluxes when incorporated into phospholipid vesicles. The ultimate goal of this work is to determine its low resolution structure using both X-ray and neutron diffraction. A number of methods were used to impart lamellar stacking order to highly purified pig Na/K-ATPase membranes. Upon partial dehydration, x-ray diffraction from Na/K-ATPase membrane multilayers at 98% relative humidity yielded discrete reflections of 118 A periodicity, diffracting to 1/14.8 A/sup -1/, additionally, continuous diffraction to 1/10 A/sup -1/ was obtained. Subjecting the membrane multilayers to high magnetic fields improved the quality of the lamellar diffraction dramatically. Neutron diffraction studies of the partially dehydrated Na/K-ATPase membrane multilayers detected a mosaic spread of 2/sup 0/ when the samples were subjected to a magnetic field of 5 Tesla perpendicular to the membrane surface; the reflections were narrower than the camera line width; hence, the lattice disorder has also decreased significantly, although only four orders were measured.

  2. Exploring Neutron-Rich Oxygen Isotopes with MoNA

    E-print Network

    N. Frank; T. Baumann; D. Bazin; J. Brown; P. A. DeYoung; J. E. Finck; A. Gade; J. Hinnefeld; R. Howes; J. -L. Lecouey; B. Luther; W. A. Peters; H. Scheit; A. Schiller; M. Thoennessen

    2007-08-20

    The Modular Neutron Array (MoNA) was used in conjunction with a large-gap dipole magnet (Sweeper) to measure neutron-unbound states in oxygen isotopes close to the neutron dripline. While no excited states were observed in 24O, a resonance at 45(2) keV above the neutron separation energy was observed in 23O.

  3. Mechanism of two types of Na emission observed in sonoluminescence

    NASA Astrophysics Data System (ADS)

    Nakajima, Ryota; Hayashi, Yuichi; Choi, Pak-Kon

    2015-07-01

    The sonoluminescence (SL) spectrum of Na atoms revealed that the Na line consists of two components, one of which is a broadened component (broad component) which is shifted from the original D lines, and the other is an unshifted narrow component (narrow component). We spatially separated the continuum, broad, and narrow components by capturing SL images using different optical filters. We also temporally separated these components by measuring SL pulses using respective band-pass filters. The SL image distribution and the timing of the SL pulses were different between the broad and narrow components. The results suggested that the broad and narrow components of Na emission are generated from different bubble populations. The dependences of SL spectra on ultrasonic frequency and dissolved rare gas (He, Ne, Ar, Kr, and Xe) were also investigated. It is concluded that the broad component and a blue satellite peak at 558 nm originate from van der Waals molecules composed of Na and rare-gas atoms. The narrow component was predicted to occur under temperature conditions at bubble collapse higher than that for the broad component.

  4. Results from CERN experiment NA36 on strangeness production

    SciTech Connect

    Not Available

    1991-12-01

    Measurements of the production of strange particles in the reactions S + Pb and S + S at beam momentum 200GeV/c per nucleon are presented. A short description of CERN experiment NA36 and the methods of raw data analysis, is followed by physics results concentrating on the dependence of strange particle production on multiplicity. Transverse momentum distributions are also presented.

  5. Study of a Large NaI(T1)Crystal

    SciTech Connect

    Kettell, S.; Littenberg, L.

    2010-03-12

    Using a narrow band positron beam, the response of a large high-resolution NaI(Ti) crystal to an incident positron beam was measured. It was found that nuclear interactions cause the appearance of additional peaks in the low energy tail of the deposited energy spectrum.

  6. Free Energy for the Permeation of Na+ Ions and Their

    E-print Network

    Lu, Benzhuo

    such hydrophilic ions as Na+ and Cl- does not assist their permeation. However, based on a simple thermodynamic difficult. On the other hand more convoluted, macroscopic properties such as ion permeation or leakage rate permeate lipid bilayers differently from halide ions, with the overall permeation rate for the Cl- being

  7. Altered erythrocyte Na-K pump in anorectic patients

    SciTech Connect

    Pasquali, R.; Strocchi, E.; Malini, P.; Casimirri, F.; Ambrosioni, E.; Melchionda, N.; Labo, G.

    1985-07-01

    The status of the erythrocyte sodium pump was evaluated in a group of patients suffering from anorexia nervosa and a group of healthy female control subjects. Anorectic patients showed significantly higher mean values of digoxin-binding sites/cell (ie, the number of Na-K-ATPase units) with respect to control subjects while no differences were found in the specific /sup 86/Rb uptake (which reflects the Na-K-ATPase activity) between the two groups. A significant correlation was found between relative weight and the number of Na-K-ATPase pump units (r = -0.66; P less than 0.0001). Anorectic patients showed lower serum T3 concentrations (71.3 +/- 53 ng/dL) with respect to control subjects (100.8 +/- 4.7 ng/dL; P less than 0.0005) and a significant negative correlation between T3 levels and the number of pump units (r = -0.52; P less than 0.003) was found. This study therefore shows that the erythrocyte Na-K pump may be altered in several anorectic patients. The authors suggest that this feature could be interrelated with the degree of underweight and/or malnutrition.

  8. National Aeronautics and Space Administration NaNotechNology Roadmap

    E-print Network

    Waliser, Duane E.

    National Aeronautics and Space Administration · NaNotechNology Roadmap Technology Area 10 Michael A: Nanotechnology. NASA developed this DRAFT Space Technology Roadmap for use by the National Research Council (NRC Nanotechnology involves the manipulation of matter at the atomic level, where convention- al physics breaks down

  9. Regulation of intracellular Na+ in health and disease: pathophysiological mechanisms and implications for treatment

    PubMed Central

    Coppini, Raffaele; Ferrantini, Cecilia; Mazzoni, Luca; Sartiani, Laura; Olivotto, Iacopo; Poggesi, Corrado; Cerbai, Elisabetta; Mugelli, Alessandro

    2013-01-01

    Transmembrane sodium (Na+) fluxes and intracellular sodium homeostasis are central players in the physiology of the cardiac myocyte, since they are crucial for both cell excitability and for the regulation of the intracellular calcium concentration. Furthermore, Na+ fluxes across the membrane of mitochondria affect the concentration of protons and calcium in the matrix, regulating mitochondrial function. In this review we first analyze the main molecular determinants of sodium fluxes across the sarcolemma and the mitochondrial membrane and describe their role in the physiology of the healthy myocyte. In particular we focus on the interplay between intracellular Ca2+ and Na+. A large part of the review is dedicated to discuss the changes of Na+ fluxes and intracellular Na+ concentration([Na+]i) occurring in cardiac disease; we specifically focus on heart failure and hypertrophic cardiomyopathy, where increased intracellular [Na+]i is an established determinant of myocardial dysfunction. We review experimental evidence attributing the increase of [Na+]i to either decreased Na+ efflux (e.g. via the Na+/K+ pump) or increased Na+ influx into the myocyte (e.g. via Na+ channels). In particular, we focus on the role of the “late sodium current” (INaL), a sustained component of the fast Na+ current of cardiac myocytes, which is abnormally enhanced in cardiac diseases and contributes to both electrical and contractile dysfunction. We analyze the pathophysiological role of INaL enhancement in heart failure and hypertrophic cardiomyopathy and the consequences of its pharmacological modulation, highlighting the clinical implications. The central role of Na+ fluxes and intracellular Na+ physiology and pathophysiology of cardiac myocytes has been highlighted by a large number of recent works. The possibility of modulating Na+ inward fluxes and [Na+]i with specific INaL inhibitors, such as ranolazine, has made Na+a novel suitable target for cardiac therapy, potentially capable of addressing arrhythmogenesis and diastolic dysfunction in severe conditions such as heart failure and hypertrophic cardiomyopathy. PMID:24689024

  10. "La escenificacin del espacio del santo en dos obras de Lope de Vega : Barln y Josaf y El santo negro Rosambuco"

    E-print Network

    Boyer, Edmond

    1 17/02/2010 "La escenificación del espacio del santo en dos obras de Lope de Vega : Barlán y piezas, la inventiva de Lope de Vega resuelve la puesta en teatro del espacio propuesto por la fuente según los episodios, se traduce por técnicas diversas de tratamiento del espacio dramático, y por otra

  11. REVALORIZACIN DEL AMBIENTE Y LOS ESPACIOS LOCALES. TRANSFORMACIONES DEL PODER Y LA AUTORIDAD LOCALES EN LATINOAMRICA BAJO LAS TENSIONES DE LOS PROCESOS DE GLOBALIZACIN

    E-print Network

    Paris-Sud XI, Université de

    REVALORIZACI�N DEL AMBIENTE Y LOS ESPACIOS LOCALES. TRANSFORMACIONES DEL PODER Y LA AUTORIDAD poder en Latinoamérica y la tendencia de revalorización del ambiente y los espacios locales. Se determina en lo importante que las autoridades actúen a través del espacio público de las estructuras

  12. Light-driven Na(+) pump from Gillisia limnaea: a high-affinity Na(+) binding site is formed transiently in the photocycle.

    PubMed

    Balashov, Sergei P; Imasheva, Eleonora S; Dioumaev, Andrei K; Wang, Jennifer M; Jung, Kwang-Hwan; Lanyi, Janos K

    2014-12-01

    A group of microbial retinal proteins most closely related to the proton pump xanthorhodopsin has a novel sequence motif and a novel function. Instead of, or in addition to, proton transport, they perform light-driven sodium ion transport, as reported for one representative of this group (KR2) from Krokinobacter. In this paper, we examine a similar protein, GLR from Gillisia limnaea, expressed in Escherichia coli, which shares some properties with KR2 but transports only Na(+). The absorption spectrum of GLR is insensitive to Na(+) at concentrations of ?3 M. However, very low concentrations of Na(+) cause profound differences in the decay and rise time of photocycle intermediates, consistent with a switch from a "Na(+)-independent" to a "Na(+)-dependent" photocycle (or photocycle branch) at ?60 ?M Na(+). The rates of photocycle steps in the latter, but not the former, are linearly dependent on Na(+) concentration. This suggests that a high-affinity Na(+) binding site is created transiently after photoexcitation, and entry of Na(+) from the bulk to this site redirects the course of events in the remainder of the cycle. A greater concentration of Na(+) is needed for switching the reaction path at lower pH. The data suggest therefore competition between H(+) and Na(+) to determine the two alternative pathways. The idea that a Na(+) binding site can be created at the Schiff base counterion is supported by the finding that upon perturbation of this region in the D251E mutant, Na(+) binds without photoexcitation. Binding of Na(+) to the mutant shifts the chromophore maximum to the red like that of H(+), which occurs in the photocycle of the wild type. PMID:25375769

  13. Análisis del Diferencial de Desempleo Andaluz y Extremeño

    Microsoft Academic Search

    Inés P. Murillo Huertas; Fernando Núñez Hernández; Carlos Usabiaga Ibáñez

    2005-01-01

    RESUMEN Andalucía y Extremadura han soportado unas tasas de desempleo sumamente elevadas en las últimas décadas, muy superiores a las del resto de España. Este trabajo pretende exponer posibles explicaciones de este fenómeno. Nuestro período básico de análisis es 1980-2000. En nuestro trabajo realizamos una revisión de las principales variables del mercado de trabajo (incluidas las institucionales): desempleo, población activa,

  14. Los Derechos de los Pacientes del Centro Clnico

    E-print Network

    Los Derechos de los Pacientes del Centro Clínico Los Derechos de los Pacientes del Centro Clínico medir las respuestas de los pacientes al tratamiento. Existen procesos que protegen los derechos de paciente que se observen los derechos fundamentales de la dignidad humana. Esta Declaración de Derechos

  15. Hoja informativa sobre la calidad del aire interior

    E-print Network

    · Moho · Polen · Caspa del pelo de los animales · Humo secundario del tabaco · Formaldehído · Monóxido de deshumidificador para ayudar a controlar el moho. · Limpie para eliminar el polvo y el pelo de los animales. · Arregle las fugas de agua para evitar el moho. · Use spray contra insectos solo cuando sea absolutamente

  16. Paso del Norte Watershed Council Coordinated Water Resources Database Project

    E-print Network

    Brown, Christopher; Sheng, Zhuping; Rich, Matt

    cooperative database project that would provide streamlined access to a range of water resource data in the Paso del Norte region. In August of 2002, the El Paso Water Utilities provided initial funding to the Paso del Norte Watershed Council to develop a...

  17. Conceptos fundamentales del desarrollo de proveedores (Caso de negocios 13)

    Microsoft Academic Search

    Enrique Yacuzzi

    2012-01-01

    El desarrollo de proveedores es una actividad que enriquece la gestión de la cadena de suministro, dotándola de mayor valor a través del aporte mutuo entre empresas clientes y subcontratistas. Este aporte incluye nuevas tecnologías, know-how, herramientas de la calidad y organización del trabajo, además de negociaciones sobre la política de precios, entre otros temas. En este trabajo presentamos sus

  18. EL ESTUDIO DEL PLUMBISMO EN DOANA Y OTROS HUMEDALES ANDALUCES

    E-print Network

    Figuerola, Jordi

    EL ESTUDIO DEL PLUMBISMO EN DOÑANA Y OTROS HUMEDALES ANDALUCES MEMORIA FINAL #12;ii Investigador Científicas (CSIC) para realizar el proyecto "EL ESTUDIO DEL PLUMBISMO EN DOÑANA Y OTROS HUMEDALES ANDALUCES....................................................................................32 3.- Plumbismo en Doñana: la radiografía de aves acuáticas, aves rapaces y sus egagropilas

  19. El marketing del partido político en el gobierno

    Microsoft Academic Search

    Pedro Barrientos Felipa

    2010-01-01

    El marketing político es un campo nuevo para los profesionales del mercadeo y es necesario conocer hasta dónde llega su campo de acción. En tal sentido, el objetivo del artículo es explicar que el marketing es, además de una actividad que puede ser utilizada en procesos electorales, también lo es para momentos en que la organización le corresponde gobernar. Es

  20. Impacto del mercadeo social en organizaciones de servicios

    Microsoft Academic Search

    Carlos Andrés Aristizabal Botero

    2007-01-01

    Este artículo es producto de la investigación “Concepciones del mercadeo social en las grandes organizaciones del sector servicio de la ciudad de Medellín en el año 2006”, la cual buscó describir las concepciones y planteamientos prospectivos establecidos en la gerencia de mercadeo, para el diseño, estructuración e implementación de acciones de Marketing Social. Las metodologías utilizadas fueron cualitativas: entrevistas semiestructuradas,

  1. La efectividad del mercadeo de las PYMES en Boyacá

    Microsoft Academic Search

    Edgar Enrique Zapata Guerrero

    2001-01-01

    El presente artículo es el resultado de una investigación cuantitativa y cualitativa, realizada en Tunja, Duitama y Sogamoso entre 1988 y el 2000, que pretende identificar de qué factores depende la efectividad de mercadeo en las pequeñas y medianas empresas del sector industrial y de servicios en Boyaca. Dicha investigación estableció que la efectividad del mercadeo depende de una mezcla

  2. Informe del Vicerrectorado Administrativo al 08/10/2014

    E-print Network

    Vásquez, Carlos

    parcial y 5 personal Administrativo Ordinarios. Otros El proceso de inclusión de preparadores que Informe del Vicerrectorado Administrativo al 08/10/2014 DIRECCIÓN DE GESTIÓN DEL CAPITAL HUMANO, 3 Administrativos Ordinarios, 2 Obreros Ordinarios y 7 HP Administrativos. Egresos: 15 Académicos

  3. Razonamiento Automatico en Sistemas de Representacion del Conocimiento

    E-print Network

    Alonso, José A.

    Razonamiento Autom´atico en Sistemas de Representaci´on del Conocimiento (y su relaci´on con la utilizaci´on de dichos sistemas para resol- ver problemas cl´asicos de la Inteligencia Artifi- cial. En el herramientas de Razonamiento Autom´atico. Entre los sistemas de representaci´on del cono- cimiento m

  4. Características y tratamiento del trastorno obsesivo resistente al tratamiento

    Microsoft Academic Search

    Daniel Navarro Bayón

    Este artículo presenta el perfil clínico del trastorno obsesivo resistente a las intervenciones terapéuti- cas de primera elección (cognitivo-conductuales y farmacológicas). No existen criterios claros en la definición del concepto de resistencia al tratamiento para los pacientes obsesivos. Para considerar a un paciente como resistente se pueden considerar los siguientes criterios: el paciente ha recibido un mí- nimo de dos

  5. Cdigos UNESCO: 3312 3305 Frecuencia del curso: Anual CEMENTOS ALCALINOS

    E-print Network

    Códigos UNESCO: 3312 3305 Frecuencia del curso: Anual CEMENTOS ALCALINOS Sede del curso: Horas Lectivas: Nº previsto de alumnos: Requisitos de admisión: Entidades que patrocinan el curso: Año en el que se impartió el curso por primera vez: Número de veces que se ha impartido el curso: Inmaculada

  6. CURSOS DE PREPARACI PER A L'OBTENCI DELS

    E-print Network

    Geffner, Hector

    CURSOS DE PREPARACIÓ PER A L'OBTENCIÓ DELS DIPLOMAS DE ESPAÑOL COMO LENGUA EXTRANJERA (DELE) - Versió en català - Versión en castellano - English version #12;CURSOS DE PREPARACIÓ DIPLOMAS DE ESPAÑOL UPF ofereix cursos de preparació per a l'obtenció del Diploma de Español como Lengua Extranjera (DELE

  7. (en transport pblic) Temps total del trajecte: 53 minuts

    E-print Network

    Oro, Daniel

    Inca > UIB (en transport públic) Temps total del trajecte: 53 minuts Inca Tren Estació tren Jacint Verdaguer o Estació Intermodal Metro UIB Comparació transport públic > vehicle privat: Comparació per 1 Emissions addicionals (SO2): 0 kg Transport públicTransport privat Comparació dels viatges acumulats durant

  8. (en transport pblic) Temps total del trajecte: 67 minuts

    E-print Network

    Oro, Daniel

    Muro > UIB (en transport públic) Temps total del trajecte: 67 minuts Muro Tren Estació tren Jacint Verdaguer o Estació Intermodal Metro UIB Comparació transport públic > vehicle privat: Comparació per 1 Emissions addicionals (SO2): 0 kg Transport públicTransport privat Comparació dels viatges acumulats durant

  9. ESTUDIO HIDROQUIMICO DEL ACUFERO DE LA VEGA DE GRANADA

    E-print Network

    Castillo, Antonio

    ESTUDIO HIDROQUIMICO DEL ACUÍFERO DE LA VEGA DE GRANADA CASTILLO, A. (1986) "Estudio hidroquímico del acuífero de la Vega de Granada". Ed. Serv. Publ. Univ. Granada (coedición con Instituto Geológico el título, sobre la hidroquímica (calidad y contaminación) de las aguas de la Vega de Granada. En

  10. Valoración económica de los servicios recreativos del parque ecológico Chipinque

    Microsoft Academic Search

    Guillermo Gándara; Rufino Tamayo

    2006-01-01

    En esta investigación se realiza una estimación del valor económico del beneficio que los visitantes obtienen por disfrutar de los servicios recreativos que ofrece el Parque Chipinque, área natural ubicada en la zona metropolitana de Monterrey, México. Se utiliza el Método de Costo de Viaje estimando una función de demanda por zonas de origen en función de diferentes costos, como

  11. La formación del Partido Conservador: la fusión conservadora

    Microsoft Academic Search

    Fidel Gómez Ochoa

    2003-01-01

    Aunque la Restauración, en cuanto a su historia política, es un período muy agraciado por lo que a atención historiográfica se refiere, todavía algunos aspectos del período están bajo el dominio de lugares comunes discutibles. Uno de ellos es la formación del Partido Conservador. En este artículo se sostiene que la fuerza formada por Antonio Cánovas, si bien hunde sus

  12. Pastoral del Nino: Bringing the Abundant Life to Paraguayan Children

    ERIC Educational Resources Information Center

    Austin, Ann Berghout; Aquino, Cyle; Burro, Elizabeth

    2007-01-01

    Pastoral del Nino is transforming children's lives in rural Paraguay. Part of Pastoral Social (Catholic Social Services), Pastoral del Nino's primary focus is to bring "vida en abundancia" (the abundant life) to families by ensuring that mothers survive childbirth and children reach their first birthdays. In addition, the organization promotes…

  13. ATTIVIT SPORTIVE DEL POLITECNICO 2 Trofeo dei Poli regionali

    E-print Network

    Leonardo, la parigina Eleonore Delattre studentessa Erasmus di Design, Marco Ferrario di Architettura della 36a Course Croisiere Edhec nella rada di Brest. Ecco i partecipanti, tutti del Politecnico: Marco Lecco fra la rappresentativa del Polo di Como (in blu) e Leonardo, poi vincitore con i `Biggols'. Altre

  14. Los hijos del terremoto: Imágenes de un recuerdo

    E-print Network

    Dauster, Frank

    1988-10-01

    pidiéndole explicaciones a Jehová" (157-8). Salvando las distancias, ésta es la familia de Hijos del terre moto, como el tío Juan de la obra tiene marcadas semejanzas con el tío Juan del autor que fue a morir a la guerra civil de España "porque había...

  15. Semi-volatiles at Mercury: Sodium (Na) and potassium (K)

    NASA Technical Reports Server (NTRS)

    Sprague, A.

    1994-01-01

    Several lines of evidence now suggest that Mercury is a planet rich in moderately-volatile elements such as Na and K. Recent mid-infrared spectral observations of Mercury's equatorial and mid-latitude region near 120 degrees mercurian longitude indicate the presence of plagioclase feldspar. Spectra of Mercury's surface exhibit spectral activity similar to labradorite (plagioclase feldspar with NaAlSi3O8: 30-50 percent) and bytownite (NaAlSi3O8: 10-30 percent). These surface studies were stimulated by the relatively large abundance of Na and K observed in Mercury's atmosphere. An enhanced column of K is observed at the longitudes of Caloris Basin and of the antipodal terrain. Extreme heating at these 'hot' longitudes and severe fracturing suffered from the large impact event could lead to enhanced outgassing from surface or subsurface materials. Alternatively, sputtering from a surface enriched in K could be the source of the observed enhancement. Recent microwave measurements of Mercury also give indirect evidence of a mercurian regolith less FeO-rich than the Moon. An anomalously high index of refraction derived from the whole-disk integrated phase curve of Danjon may also be indicative of surface sulfides contributing to a regolith that is moderately volatile-rich. The recent exciting observations of radar-bright spots at high latitudes also indicate that a substance of high volume scattering, like ice, is present in shadowed regions. Other radar-bright spots have been seen at locations of Na enhancements on the atmosphere. All combined, these pieces of evidence point to a planet that is not severely depleted in volatiles or semi-volatiles.

  16. Expression of epithelial Na channels in Xenopus oocytes

    PubMed Central

    1990-01-01

    Epithelial Na channel activity was expressed in oocytes from Xenopus laevis after injection of mRNA from A6 cells, derived from Xenopus kidney. Poly A(+) RNA was extracted from confluent cell monolayers grown on either plastic or permeable supports. 1-50 ng RNA was injected into stage 5-6 oocytes. Na channel activity was assayed as amiloride- sensitive current (INa) under voltage-clamp conditions 1-3 d after injection. INa was not detectable in noninjected or water-injected oocytes. This amiloride-sensitive pathway induced by the mRNA had a number of characteristics in common with that in epithelial cells, including (a) high selectivity for Na over K, (b) high sensitivity to amiloride with an apparent K1 of approximately 100 nM, (c) saturation with respect to external Na with an apparent Km of approximately 10 mM, and (d) a time-dependent activation of current with hyperpolarization of the oocyte membrane. Expression of channel activity was temperature dependent, being slow at 19 degrees C but much more rapid at 25 degrees C. Fractionation of mRNA on a sucrose density gradient revealed that the species of RNA inducing channel activity had a sedimentation coefficient of approximately 17 S. Treatment of filter-grown cells with 300 nM aldosterone for 24 h increased Na transport in the A6 cells by up to fivefold but did not increase the ability of mRNA isolated from those cells to induce channel activity in oocytes. The apparent abundance of mRNA coding for channel activity was 10-fold less in cells grown on plastic than in those grown on filters, but was increased two- to threefold by aldosterone. PMID:2170563

  17. Nro. 12/2009 Acta de la reunin del Consejo Extraordinario de Coordinadores

    E-print Network

    Vásquez, Carlos

    Jubilaciones del personal académico. Se notificó que el ex-vicerrector administrativo de la USB, Prof. Ferrer cual se manejó el proceso de solicitud y entrega del presupuesto por parte del Gobierno Nacional. 9. Se

  18. BOLETN OFICIAL DEL ESTADO Nm. 289 Jueves 1 de diciembre de 2011 Sec. III. Pg. 127986

    E-print Network

    Fitze, Patrick

    , dentro del Eje 3 «Aumento y mejora del Capital Humano», Tema Prioritario 74 «Desarrollar el potencial Humano en el ámbito de la Investigación y la Innovación». La tasa de cofinanciación del FSE es de un 80

  19. Na0.44MnO2 nanorods as a cathode material for Na-ion batteries

    NASA Astrophysics Data System (ADS)

    Avci, Sevda; Oz, Erdinc; Demirel, Serkan; Altin, Emine; Altin, Serdar; Bayri, Ali; Yakinci, Eyyuphan

    2014-03-01

    Lithium-ion batteries have dominated the rechargeable battery market because of their high energy and power capability. On the other hand, sodium is one of the more abundant elements on Earth unlike Li. Moreover, Na has similar chemical properties to Li, indicating that Na-ion batteries can be an alternative to Li counterparts. With that respect, we have synthesized Na0.44MnO2 nanorods as cathode materials for Na-ion batteries. We have investigated the effects of structural, electrical, and magnetic properties on battery performance. We report the synthesis conditions and growth mechanism of the nanorods. The structure and the morphology of the materials were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), and atomic force microscopy (AFM) techniques. Temperature dependent structural changes were determined via in situ X-ray diffraction and TG-DTA measurements showing structural changes above room temperature. This work is funded by The Scientific and Technological Research Council of Turkey with Grant No:112M487.

  20. Hermen àutica objetiva? e sua apropria Ô úo na pesquisa emp §rica na írea da educa Ô úo

    Microsoft Academic Search

    Rita Amelia Teixeira Vilela; Juliane Noack-Napoles

    2010-01-01

    Este texto apresenta a metodologia de pesquisa social qualitativa denominada ?hermen àutica objetiva? desenvolvida pelo soci logo alem úo Ulrich Oeverman e aponta sua propriedade na pesquisa educacional. Derivada da tradi Ô úo interpretativa da Teoria Cr §tica de Theodor Adorno, a finalidade da an ílise ?hermen àutica objetiva? ø descortinar a l gica entre as estruturas de reprodu Ô

  1. Valence and excited dipole-bound states of polar diatomic anions: LiH -, LiF -, LiCl -, NaH -, NaF -, NaCl -, BeO -, and MgO -

    NASA Astrophysics Data System (ADS)

    Gutsev, Gennady L.; Nooijen, Marcel; Bartlett, Rodney J.

    1997-09-01

    Valence and excited states of the anions formed by the polar molecules LiH, LiF, LiCl, NaH, NaF, NaCl, BeO, and MgO are calculated by the recently developed electron-attachment equation-of-motion coupled-cluster (EA-EOMCC) method. The LiH -, NaH -, and LiF - anions are found to possess two excited dipole-bound states and the LiCl -, NaF -, NaCl -, BeO -, and MgO - anions have three excited dipole-bound states. The critical values of the dipole moment required to sustain the first, second, etc., excited state appears to be specific for each class of polar molecules.

  2. Illuminating water and life: Emilio Del Giudice.

    PubMed

    Ho, Mae-Wan

    2015-06-01

    The quantum electrodynamics theory of water put forward by Del Giudice and colleagues provides a useful foundation for a new science of water for life. The interaction of light with liquid water generates quantum coherent domains in which the water molecules oscillate between the ground state and an excited state close to the ionizing potential of water. This produces a plasma of almost free electrons favoring redox reactions, the basis of energy metabolism in living organisms. Coherent domains stabilized by surfaces, such as membranes and macromolecules, provide the excited interfacial water that enables photosynthesis to take place, on which most of life on Earth depends. Excited water is the source of superconducting protons for rapid intercommunication within the body. Coherent domains can also trap electromagnetic frequencies from the environment to orchestrate and activate specific biochemical reactions through resonance, a mechanism for the most precise regulation of gene function. PMID:26098522

  3. [Strengths and future of the Revista Médica del Instituto Mexicano del Seguro Social].

    PubMed

    Fajardo-Dolci, Germán

    2014-01-01

    The journals of medicine arose as a communication tool more than 200 years ago. At the beginning, their nature was local; later, their aim was to spread medical information along the nation; and, finally, they sought to reach the world distribution. The Revista Médica del Instituto Mexicano del Seguro Social was published for the first time 52 years ago, and it has walked its way from local to international distribution. This journal has 23 000 subscribers, it is included in Medline and it reached a 0.112 SCImago Journal Rank in 2012. Its website receives around 200 000 visits monthly and 45 % are foreign visits. In the future, the peer review system is going to be strengthened, and the journal is going to offer audio, video, and applications to reinforce interactive participation between authors, readers in order to reach modernity and draw young new attention. PMID:24758842

  4. Genetic variation of the alpha subunit of the epithelial Na+ channel influences exhaled Na+ in healthy humans.

    PubMed

    Foxx-Lupo, William T; Wheatley, Courtney M; Baker, Sarah E; Cassuto, Nicholas A; Delamere, Nicholas A; Snyder, Eric M

    2011-12-15

    Epithelial Na(+) channels (ENaC) are located in alveolar cells and are important in ?(2)-adrenergic receptor-mediated lung fluid clearance through the removal of Na(+) from the alveolar airspace. Previous work has demonstrated that genetic variation of the alpha subunit of ENaC at amino acid 663 is important in channel function: cells with the genotype resulting in alanine at amino acid 663 (A663) demonstrate attenuated function when compared to genotypes with at least one allele encoding threonine (T663, AT/TT). We sought to determine the influence of genetic variation at position 663 of ENaC on exhaled Na(+) in healthy humans. Exhaled Na(+) was measured in 18 AA and 13 AT/TT subjects (age=27±8 years vs. 30±10 years; ht.=174±12 cm vs. 171±10 cm; wt.=68±12 kg vs. 73±14 kg; BMI=22±3 kg/m(2) vs. 25±4 kg/m(2), mean±SD, for AA and AT/TT, respectively). Measurements were made at baseline and at 30, 60 and 90 min following the administration of a nebulized ?(2)-agonist (albuterol sulfate, 2.5 mg diluted in 3 ml normal saline). The AA group had a higher baseline level of exhaled Na(+) and a greater response to ?(2)-agonist stimulation (baseline=3.1±1.8 mmol/l vs. 2.3±1.5 mmol/l; 30 min-post=2.1±0.7 mmol/l vs. 2.2±0.8 mmol/l; 60 min-post=2.0±0.5 mmol/l vs. 2.3±1.0 mmol/l; 90 min-post=1.8±0.8 mmol/l vs. 2.6±1.5 mmol/l, mean±SD, for AA and AT/TT, respectively, p<0.05). The results are consistent with the notion that genetic variation of ENaC influences ?(2)-adrenergic receptor stimulated Na(+) clearance in the lungs, as there was a significant reduction in exhaled Na(+) over time in the AA group. PMID:21889619

  5. Ttulo del Trabajo: Acerca del estilo de pensamiento en los inicios de la Historia de la Ciencia en la Argentina

    E-print Network

    Paris-Sud XI, Université de

    1 Título del Trabajo: Acerca del estilo de pensamiento en los inicios de la Historia de la Ciencia Nacional de Río Cuarto. Facultad de Ciencias Humanas y Facultad de Ciencias Exactas, Físico ­ Químicas y Naturales. Introducción: Una mirada a las actas de las Jornadas de Historias de la Ciencia Argentina (2003

  6. Llamado a cubrir Beca de investigacin. Uso del agua en Sistemas de Produccin Agrcola del Chaco Semirido.

    E-print Network

    Nacional de San Luis, Universidad

    agua en sistemas de producción agrícola en el Chaco Semiárido mediante modelos funcionales de cultivoLlamado a cubrir Beca de investigación. Uso del agua en Sistemas de Producción Agrícola del Chaco iniciar su carrera enfatizando una aproximación sistémica asistida por el uso de modelos matemáticos. L

  7. EL ABOGADO DEL NIÑO COMO GARANTE DEL PLENO EJERCICIO DE LOS DERECHOS DE LOS MENORES DE EDAD

    Microsoft Academic Search

    Lisbeth Rodríguez Martín; Yanelys Palmero Martín

    2012-01-01

    El tratamiento de la niñez y sus derechos resulta tema de interés universal para las ciencias jurídicas modernas, debido a las nuevas tendencias de protección surgidas a partir de la celebración de los Congresos Panamericanos del Niño y la Convención sobre los Derechos del Niño. De modo, que para las ciencias jurídicas cubanas se hace de suma importancia el estudio

  8. La intervención estatal en el mercado del suelo urbano. La reconstrucción del eje cafetero: El caso de Armenia

    Microsoft Academic Search

    Santiago Alberto Camargo; Samuel Jaramillo González

    2011-01-01

    A raíz del pavoroso terremoto que tuvo lugar en el Eje Cafetero colombiano en 1999, que causó grandes pérdidas humanas y una gran destrucción, sobre todo del stock inmobiliario, hubo un gran esfuerzo nacional de solidaridad tanto estatal como privado para socorrer las víctimas. El principal rubro fueron recursos en la forma de subsidios a los afectados para que compraran

  9. Renal brush-border membrane Na(+)-sulfate cotransport: stimulation by thyroid hormone.

    PubMed

    Tenenhouse, H S; Lee, J; Harvey, N

    1991-09-01

    The present study was undertaken to examine the interaction of phosphonoformic acid (PFA) with the Na(+)-sulfate cotransporter and the effect of thyroid hormone (triiodothyronine; T3) on Na(+)-dependent sulfate transport and Na(+)-dependent PFA binding in mouse renal brush-border membrane vesicles. PFA inhibits Na(+)-dependent sulfate transport in a competitive manner [apparent inhibitory constant (Ki) = 4.3 +/- 1.1 mM]. T3 administered in pharmacological doses significantly stimulates Na(+)-dependent sulfate transport in renal brush-border membranes compared with vehicle-treated controls. Although T3 has no effect on Na(+)-dependent glucose transport, T3 also stimulates Na(+)-dependent phosphate transport. Kinetic studies demonstrate that T3 increases the apparent maximal velocity (Vmax) for Na(+)-sulfate cotransport without changing the apparent Michaelis constant (Km). T3 does not significantly affect either Na(+)-dependent PFA binding or the phosphate- and sulfate-displaceable components of Na(+)-dependent PFA binding. Finally, Na(+)-dependent brush-border membrane sulfate transport is unchanged in phosphate-deprived mice that exhibit increased Na(+)-phosphate cotransport and in X-linked Hyp mice that exhibit impaired Na(+)-phosphate cotransport. The present results demonstrate that 1) PFA is a competitive inhibitor of Na(+)-sulfate cotransport, 2) T3 stimulates Na(+)-dependent sulfate, as well as Na(+)-dependent phosphate transport, but has no effect on PFA binding, and 3) phosphate deprivation and the X-linked Hyp mutation do not influence Na(+)-sulfate cotransport.(ABSTRACT TRUNCATED AT 250 WORDS) PMID:1832265

  10. Thyroid hormones increase Na+-H+ exchange activity in renal brush border membranes.

    PubMed Central

    Kinsella, J; Sacktor, B

    1985-01-01

    Na+-H+ exchange activity, i.e., amiloride-sensitive Na+ and H+ flux, in renal proximal tubule brush border (luminal) membrane vesicles was increased in the hyperthyroid rat and decreased in the hypothyroid rat, relative to the euthyroid animal. A positive correlation was found between Na+-H+ exchange activity and serum concentrations of thyroxine (T4) and triiodothyronine (T3). The thyroid status of the animal did not alter amiloride-insensitive Na+ uptake. The rate of passive pH gradient dissipation was higher in membrane vesicles from hyperthyroid rats compared to the rate in vesicles from hypothyroid animals, a result which would tend to limit the increase in Na+ uptake in vesicles from hyperthyroid animals. Na+-dependent phosphate uptake was increased in membrane vesicles from hyperthyroid rats; Na+-dependent D-glucose and L-proline uptakes were not changed by the thyroid status of the animal. The effect of thyroid hormones in increasing the uptake of Na+ in the brush border membrane vesicle is consistent with the action of the hormones in enhancing renal Na+ reabsorption. Further, the regulation of transtubular Na+ flux has now been shown to be concomitant with modulation of the entry of Na+ into the tubular cell across its luminal membrane, mediated by the exchange reaction, and with the previously reported control of the pumping of Na+ out of the cell across its basolateral membrane, mediated by the Na+,K+-ATPase. PMID:2987936

  11. Validation of estimating food intake in gray wolves by 22Na turnover

    USGS Publications Warehouse

    DelGiudice, G.D.; Duquette, L.S.; Seal, U.S.; Mech, L.D.

    1991-01-01

    We studied 22sodium (22Na) turnover as a means of estimating food intake in 6 captive, adult gray wolves (Canis lupus) (2 F, 4 M) over a 31-day feeding period. Wolves were fed white-tailed deer (Odocoileus virginianus) meat only. Mean mass-specific exchangeable Na pool was 44.8 .+-. 0.7 mEq/kg; there was no differeence between males and females. Total exchangeable Na was related (r2 = 0.85, P < 0.009) to body mass. Overall, 22Na turnover overestimated Na intake by 9.8 .+-. 2.4% after 32 days. Actual Na intake was similar in males and females; however, Na turnover (P < 0.05) and the discrepancy (P < 0.01) between turnover and actual Na intake were greater in females than males. From Day 8 to the end of the study, the absolute difference (mEq) between Na intake and Na turnover remained stable. Sodium turnover (mEq/kg/day) was a reliable (r2 = 0.91, P < 0.001) estimator of food consumption (g/kg/day) in wolves over a 32-day period. Sampling blood and weighing wolves every 1-4 days permitted identification of several potential sources of error, including changes in size of exchangeable Na pools, exchange of 22Na with gastrointestinal and bone Na, and rapid loss of the isotope by urinary excretion.

  12. Hygroscopic properties of NaCl and NaNO3 mixture particles as reacted inorganic sea-salt aerosol surrogates

    NASA Astrophysics Data System (ADS)

    Gupta, D.; Kim, H.; Park, G.; Li, X.; Eom, H.-J.; Ro, C.-U.

    2014-12-01

    NaCl in fresh sea-salt aerosol (SSA) particles can partially or fully react with atmospheric NOx / HNO3, so internally mixed NaCl and NaNO3 aerosol particles can co-exist over a wide range of mixing ratios. Laboratory-generated, micrometer-sized NaCl and NaNO3 mixture particles at ten mixing ratios (mole fractions of NaCl (XNaCl) = 0.1 to 0.9) were examined systematically to observe their hygroscopic behavior, derive experimental phase diagrams for deliquescence and efflorescence, and understand the efflorescence mechanism. During the humidifying process, aerosol particles with the eutonic composition (XNaCl = 0.38) showed only one phase transition at their mutual deliquescence relative humidity (MDRH) of 67.9(± 0.5)%. On the other hand, particles with other mixing ratios showed two distinct deliquescence transitions, i.e., the eutonic component dissolved at MDRH and the remainder in the solid phase dissolved completely at their DRHs depending on the mixing ratios, resulting in a phase diagram composed of four different phases, as predicted thermodynamically. During the dehydration process, NaCl-rich particles (XNaCl > 0.38) showed two-stage efflorescence transitions: the first stage was purely driven by the homogeneous nucleation of NaCl and the second stage at the mutual efflorescence RH (MERH) of the eutonic components, with values in the range of 30.0-35.5%. Interestingly, aerosol particles with the eutonic composition (XNaCl = 0.38) also showed two-stage efflorescence with NaCl crystallizing first followed by heterogeneous nucleation of the remaining NaNO3 on the NaCl seeds. NaNO3-rich particles XNaCl ? 0.3) underwent single-stage efflorescence transitions at ERHs progressively lower than the MERH, because of the homogeneous nucleation of NaCl and the almost simultaneous heterogeneous nucleation of NaNO3 on the NaCl seeds. SEM/EDX elemental mapping indicated that the effloresced NaCl-NaNO3 particles at all mixing ratios were composed of a homogeneously crystallized NaCl moiety in the center, surrounded either by the eutonic component (for XNaCl > 0.38) or NaNO3 (for XNaCl ? 0.38). During the humidifying or dehydration process, the amount of eutonic composed part drives particle/droplet growth or shrinkage at the MDRH or MERH (second ERH), respectively, and the amount of remnant pure salts (NaCl or NaNO3 in NaCl- or NaNO3-rich particles, respectively) drives the second DRHs or first ERHs, respectively. Therefore, their behavior can be a precursor to the optical properties and direct radiative forcing for these atmospherically relevant mixture particles representing the coarse, reacted inorganic SSAs. In addition, the NaCl-NaNO3 mixture aerosol particles can maintain an aqueous phase over a wider RH range than the genuine SSA surrogate (i.e., pure NaCl particles), making their heterogeneous chemistry more probable.

  13. Hygroscopic properties of NaCl and NaNO3 mixture particles as reacted inorganic sea-salt aerosol surrogates

    NASA Astrophysics Data System (ADS)

    Gupta, D.; Kim, H.; Park, G.; Li, X.; Eom, H.-J.; Ro, C.-U.

    2015-03-01

    NaCl in fresh sea-salt aerosol (SSA) particles can partially or fully react with atmospheric NOx/HNO3, so internally mixed NaCl and NaNO3 aerosol particles can co-exist over a wide range of mixing ratios. Laboratory-generated, micrometer-sized NaCl and NaNO3 mixture particles at 10 mixing ratios (mole fractions of NaCl (XNaCl) = 0.1 to 0.9) were examined systematically to observe their hygroscopic behavior, derive experimental phase diagrams for deliquescence and efflorescence, and understand the efflorescence mechanism. During the humidifying process, aerosol particles with the eutonic composition (XNaCl = 0.38) showed only one phase transition at their mutual deliquescence relative humidity (MDRH) of 67.9 (±0.5)% On the other hand, particles with other mixing ratios showed two distinct deliquescence transitions; i.e., the eutonic component dissolved at MDRH, and the remainder in the solid phase dissolved completely at their DRHs depending on the mixing ratios, resulting in a phase diagram composed of four different phases, as predicted thermodynamically. During the dehydration process, NaCl-rich particles (XNaCl > 0.38) showed a two stage efflorescence transition: the first stage was purely driven by the homogeneous nucleation of NaCl and the second stage at the mutual efflorescence RH (MERH) of the eutonic components, with values in the range of 30.0-35.5%. Interestingly, aerosol particles with the eutonic composition (XNaCl = 0.38) also showed two-stage efflorescence, with NaCl crystallizing first followed by heterogeneous nucleation of the remaining NaNO3 on the NaCl seeds. NaNO3-rich particles (XNaCl ? 0.3) underwent single-stage efflorescence transitions at ERHs progressively lower than the MERH because of the homogeneous nucleation of NaCl and the almost simultaneous heterogeneous nucleation of NaNO3 on the NaCl seeds. SEM/EDX elemental mapping indicated that the effloresced NaCl-NaNO3 particles at all mixing ratios were composed of a homogeneously crystallized NaCl moiety in the center, surrounded either by the eutonic component (for XNaCl > 0.38) or NaNO3 (for XNaCl ? 0.38). During the humidifying or dehydration process, the amount of eutonic composed part drives particle/droplet growth or shrinkage at the MDRH or MERH (second ERH), respectively, and the amount of pure salts (NaCl or NaNO3 in NaCl- or NaNO3-rich particles, respectively) drives the second DRHs or first ERHs, respectively. Therefore, their behavior can be a precursor to the optical properties and direct radiative forcing for these atmospherically relevant mixture particles representing the coarse, reacted inorganic SSAs. In addition, the NaCl-NaNO3 mixture aerosol particles can maintain an aqueous phase over a wider RH range than pure NaCl particles as SSA surrogate, making their heterogeneous chemistry more probable.

  14. Modi rari di annichilazione del sistema protone-antiprotone e struttura elettromagnetica del nucleone

    Microsoft Academic Search

    Marcello Conversi

    1965-01-01

    \\u000a Sunto  Quando un antiprotone annichila con un protone per lo più si originano dei mesoni ? (pioni) ok. In conseguenza del fatto, però, che il nucleone (e l’antinucleone) hanno una loro struttura elettromagnetica, sono possibili\\u000a annichilazioni — peraltro oltremodo rare — in coppie di leptoni (e+ e?; ?+ ??;...). Lo studio di questi processi rari permette di estendere ad una regione

  15. Aprovaci de la proposta d'assignaci de complements addicionals de docncia del PDI

    E-print Network

    Yannuzzi Sanchez, Marcelo

    Aprovació de la proposta d'assignació de complements addicionals de docència del PDI (Convocatòria complements addicionals de docència del PDI (convocatòria 2013) · Document proposta informat favorablement per

  16. [Effect of NaHCO3 stress on uptake and transportation of Na+, K+ and Ca2+ in three shrub species].

    PubMed

    Mao, Gui-Lian; Li, Guo-Qi; Xu, Xing; Zhang, Xin-Xue

    2014-03-01

    We detected absorption and transportation of ions in the leaves of Atriplex nummularia, Atriplex canescens and Lycium barbarum under NaHCO3 stress (300 mmol x L(-1)) by using atomic absorption spectrophotometry and non-invasive ion flux measurement. The results showed that leaves of the A. nummularia, A. canescens and L. barbarum exhibited a high capacity to induce the Na+ accumulation when compared with that of control. The higher the concentration of NaHCO3 treatment, the more Na+ accumulated in the leaves of the three plants under experimental condition. L. barbarum showed a higher Na+ efflux in the mesophyll cells, whereas A. nummularia and A. canescens showed a relative lower efflux. A lower K+ content and a higher Na+/K+ ratio were detected in leaves of A. nummularia and L. barbarum. However, a higher K+ content and a lower Na+/K+ ratio were seen in leaves of A. canescens. Due to induction of Ca2+ efflux under the NaHCO3 treatment, a lower Ca2+ content and a higher Na+/Ca2+ ratio were observed in L. barbarum. On the contrary, a higher Ca2+ influx was observed in A. nummularia and A. canescens. These results suggested that the three shrubs species had different Na+ segmentation strategies. The accumulation of Na+ inhibited Ca2+ absorption in leaves of L. barbarum, while in the A. nummularia and A. canescens, Ca2+ influx induced [Ca2+]cyt which preserved a less-depolarized PM and then inhibited K efflux. The maintaining of cellular K+/Na+ homeostasis in A. nummularia and A. canescens might be achieved by the induction of [Ca2+]cyt under the NaHCO3 treatment. PMID:24984488

  17. Crystal structure of new synthetic Ca,Na carbonate-borate Ca2Na(Na x Ca0.5 - x )[B{3/ t }B{2/?}O8(OH)(O1 - x OH x )](CO3)

    NASA Astrophysics Data System (ADS)

    Yamnova, N. A.; Borovikova, E. Yu.; Gurbanova, O. A.; Dimitrova, O. V.; Zubkova, N. V.

    2012-05-01

    New Ca,Na carbonate-borate Ca2Na(Na x Ca0.5 - x ) [B{3/ t }B{2/?}O8(OH)(O1 - x OH x )](CO3) crystals ( x ˜ 0.4) have been synthesized by the hydrothermal method in the Ca(OH)2-H3BO3-Na2CO3-NaCl-system at t = 250°C and P = 70-80 atm; the structure parameters are found to be a = 11.1848(3) Å, b = 6.4727(2) Å, c = 25.8181(7) Å, ? = 96.364(3)°, V = 1857.60(9) Å3, sp. gr. C2/ c, Z = 8, and ?calcd = 2.801 g/cm3 (Xcalibur S autodiffractometer (CCD), 2663 reflections with I > 2? ( I), direct solution, refinement by the least-squares method in the anisotropic approximation of thermal atomic vibrations, hydrogen localization, R 1 = 0.0387). The structure is based on boron-oxygen layers of pentaborate radicals 5(2? + 3T). Ca and Na polyhedra and CO3 triangles are located between the layers. A crystallochemical analysis of the new Ca,Na carbonate-borate has established its similarity to natural Na,Ca pentaborates (heidornite and tuzlaite) and synthetic Na,Ba-decaborate.

  18. Synthesis and characterization of sodium-titanium phosphates, Na4(TiO)(PO4)2, Na(TiO)PO4, and NaTi2(PO4)3

    Microsoft Academic Search

    Carlos E. Bamberger; George M. Begun; O. B. Cavin

    1988-01-01

    Experimental examination of part of the system Na2O-TiO2-P2O5 revealed the existence of two new sodium-titanium phosphates, Na4(TiO)(PO4)2 and Na(TiO)PO4. Their synthesis was accomplished by several different reactions and their identity was established by means of Raman spectroscopy and X-ray diffraction. Additionally, novel reactions for the synthesis of NaTi2(PO4)3 have been demonstrated.

  19. Synthesis and characterization of sodium-titanium phosphates, Na/sub 4/(TiO)(PO/sub 4/)/sub 2/, Na(TiO)PO/sub 4/, and NaTi/sub 2/(PO/sub 4/)/sub 3/*

    SciTech Connect

    Bamberger, C.E.; Begun, G.E.; Cavin, O.B.

    1988-04-01

    Experimental examination of part of the system Na/sub 2/O-TiO/sub 2/-P/sub 2/O/sub 5/ revealed the existence of two new sodium-titanium phosphates, Na(TiO)(PO)/sub 4/ and Na(TiO)P)/sub 4/. Their synthesis was accomplished by several different reactions and their identity was established by means of Raman spectroscopy and X-ray diffraction. Additionally, novel reactions for the synthesis of NaTi/sub 2/(PO/sub 4/)/sub 3/ have been demonstrated.

  20. Heterogeneous reactions of HNO3(g) + NaCl(s) yields HCl(g) + NaNO3(s) and N2O5(g) + NaCl(s) yields ClNO2(g) + NaNO3(s)

    NASA Technical Reports Server (NTRS)

    Leu, Ming-Taun; Timonen, Raimo S.; Keyser, Leon F.; Yung, Yuk L.

    1995-01-01

    The heterogeneous reactions of HNO3(g) + NaCl(s) yields HCl(g) + NaNO3(s) (eq 1) and N2O5(g) + NaCl(s) yields ClNO2(g) + NaNO3(S) (eq 2) were investigated over the temperature range 223-296 K in a flow-tube reactor coupled to a quadrupole mass spectrometer. Either a chemical ionization mass spectrometer (CIMS) or an electron-impact ionization mass spectrometer (EIMS) was used to provide suitable detection sensitivity and selectivity. In order to mimic atmospheric conditions, partial pressures of HNO3 and N2O5 in the range 6 x 10(exp -8) - 2 x 10(exp -6) Torr were used. Granule sizes and surface roughness of the solid NaCl substrates were determined by using a scanning electron microscope. For dry NaCl substrates, decay rates of HNO3 were used to obtain gamma(1) = 0.013 +/- 0.004 (1sigma) at 296 K and > 0.008 at 223 K, respectively. The error quoted is the statistical error. After all corrections were made, the overall error, including systematic error, was estimated to be about a factor of 2. HCl was found to be the sole gas-phase product of reaction 1. The mechanism changed from heterogeneous reaction to predominantly physical adsorption when the reactor was cooled from 296 to 223 K. For reaction 2 using dry salts, gamma(2) was found to be less than 1.0 x 10(exp -4) at both 223 and 296 K. The gas-phase reaction product was identified as ClNO2 in previous studies using an infrared spectrometer. An enhancement in reaction probability was observed if water was not completely removed from salt surfaces, probably due to the reaction of N2O5(g) + H2O(s) yields 2HNO3(g). Our results are compared with previous literature values obtained using different experimental techniques and conditions. The implications of the present results for the enhancement of the hydrogen chloride column density in the lower stratosphere after the El Chichon volcanic eruption and for the chemistry of HCl and HNO3 in the marine troposphere are discussed.

  1. Grant Title: HEWLETT FOUNDATION EDUCATION PROGRAM Funding Opportunity Number: N/A

    E-print Network

    Farritor, Shane

    are awarded to organizations by invitation. Amount: N/A Length of Support: N/A Eligible Applicants: Non-profit organizations, higher education institutions, school districts. Summary: The Hewlett Foundation makes grants

  2. Grant Title: POSTDOCTORAL FELLOWSHIP IN MENTAL HEALTH AND SUBSTANCE ABUSE SERVICES Funding Opportunity Number: NA

    E-print Network

    Farritor, Shane

    Grant Title: POSTDOCTORAL FELLOWSHIP IN MENTAL HEALTH AND SUBSTANCE ABUSE SERVICES (MHSAS) Funding Opportunity Number: NA Agency/Department: American Psychological Association (APA), Substance Abuse and Mental health and substance abuse services and research. Release and Expiration: NA Application Deadline

  3. Na+ accumulation in root symplast of sunflower plants exposed to moderate salinity is transpiration-dependent.

    PubMed

    Quintero, José Manuel; Fournier, José María; Benlloch, Manuel; Rodríguez-Navarro, Alonso

    2008-08-25

    Twenty-day-old sunflower plants (Helianthus annuus L. cv Sun-Gro 380) grown hydroponically under controlled conditions were used to study the effect of transpiration on Na(+) compartmentalization in roots. The plants were exposed to low Na(+) concentrations (25 mM NaCl) and different environmental humidity conditions over a short time period (8.5 h). Under these conditions, Na(+) was accumulated primarily in the root, but only the Na(+) accumulated in the root symplast was dependent on transpiration, while the Na(+) accumulated in both the shoot and the root apoplast exhibited a low transpiration dependence. Moreover, Na(+) content in the root apoplast was reached quickly (0.25 h) and increased little with time. These results suggest that, in sunflower plants under moderate salinity conditions, Na(+) uptake in the root symplast is mediated by a transport system whose activity is enhanced by transpiration. PMID:18166246

  4. Caustic Recycle from Hanford Tank Waste Using Large Area NaSICON Structures (LANS)

    SciTech Connect

    Fountain, Matthew S.; Sevigny, Gary J.; Balagopal, S.; Bhavaraju, S.

    2009-03-31

    This report presents the results of a 5-day test of an electrochemical bench-scale apparatus using a proprietary (NAS-GY) material formulation of a (Na) Super Ion Conductor (NaSICON) membrane in a Large Area NaSICON Structures (LANS) configuration. The primary objectives of this work were to assess system performance, membrane seal integrity, and material degradation while removing Na from Group 5 and 6 tank waste from the Hanford Site.

  5. Membrane Na+-pyrophosphatases Can Transport Protons at Low Sodium Concentrations*

    PubMed Central

    Luoto, Heidi H.; Nordbo, Erika; Baykov, Alexander A.; Lahti, Reijo; Malinen, Anssi M.

    2013-01-01

    Membrane-bound Na+-pyrophosphatase (Na+-PPase), working in parallel with the corresponding ATP-energized pumps, catalyzes active Na+ transport in bacteria and archaea. Each ?75-kDa subunit of homodimeric Na+-PPase forms an unusual funnel-like structure with a catalytic site in the cytoplasmic part and a hydrophilic gated channel in the membrane. Here, we show that at subphysiological Na+ concentrations (<5 mm), the Na+-PPases of Chlorobium limicola, four other bacteria, and one archaeon additionally exhibit an H+-pumping activity in inverted membrane vesicles prepared from recombinant Escherichia coli strains. H+ accumulation in vesicles was measured with fluorescent pH indicators. At pH 6.2–8.2, H+ transport activity was high at 0.1 mm Na+ but decreased progressively with increasing Na+ concentrations until virtually disappearing at 5 mm Na+. In contrast, 22Na+ transport activity changed little over a Na+ concentration range of 0.05–10 mm. Conservative substitutions of gate Glu242 and nearby Ser243 and Asn677 residues reduced the catalytic and transport functions of the enzyme but did not affect the Na+ dependence of H+ transport, whereas a Lys681 substitution abolished H+ (but not Na+) transport. All four substitutions markedly decreased PPase affinity for the activating Na+ ion. These results are interpreted in terms of a model that assumes the presence of two Na+-binding sites in the channel: one associated with the gate and controlling all enzyme activities and the other located at a distance and controlling only H+ transport activity. The inherent H+ transport activity of Na+-PPase provides a rationale for its easy evolution toward specific H+ transport. PMID:24158447

  6. Mechanisms of coronary vasoconstriction induced by Na arachidonate in experimentally diabetic dogs

    Microsoft Academic Search

    L. Sterin-Borda; E. Borda; E. J. del Castillo; M. F. Gimeno; A. L. Gimeno

    1982-01-01

    Summary Na arachidonate (NaA) enhanced the resting basal tone of isolated coronary arteries from diabetic dogs and depressed it in coronary arteries from normal controls. Inhibitors of thromboxane A2 biosynthesis and of lipoxygenases abolished the vasoconstrictor effect of NaA on diabetic arteries, whereas inhibitors of cyclooxygenase activity and PGI2 biosynthesis blocked the vasodilating action of NaA on normal arteries.

  7. Function and presumed molecular structure of Na + -D-glucose cotransport systems

    Microsoft Academic Search

    H. Koepsell; J. Spangenberg

    1994-01-01

    Functional characterization of Na+-d-glucose cotransport in intestine and kidney indicates the existence of heterogeneous Na+-d-glucose cotransport systems. Target size analysis of the transporting unit and model analysis of substrate binding have been performed and proteins have been cloned which mediate (SGLT1) and modulate (RS1) the expression of Na+-d-glucose cotransport. The experiments support the hypothesis that functional Na+-d-glucose cotransport systems in

  8. A new polymer electrolyte system (PEO) n :NaPO 3

    Microsoft Academic Search

    Amrtha Bhide; K. Hariharan

    2006-01-01

    A new Na+ ion conducting polymer electrolyte, based on poly(ethylene oxide) (PEO) and sodium meta phosphate (NaPO3) is investigated. (PEO)n:NaPO3 polymer metal salt complexes with different [ethylene oxide]\\/Na ratios (n=3, 4, 6, 8 and 10) are prepared by the solution casting method. Dissolution of the salt into the polymer host is confirmed by X-ray diffraction, differential scanning calorimetry (DSC) and

  9. Hofmeister effects of anions on the kinetics of partial reactions of the Na+,K+-ATPase.

    PubMed Central

    Ganea, C; Babes, A; Lüpfert, C; Grell, E; Fendler, K; Clarke, R J

    1999-01-01

    The effects of lyotropic anions, particularly perchlorate, on the kinetics of partial reactions of the Na+,K+-ATPase from pig kidney were investigated by two different kinetic techniques: stopped flow in combination with the fluorescent label RH421 and a stationary electrical relaxation technique. It was found that 130 mM NaClO4 caused an increase in the Kd values of both the high- and low-affinity ATP-binding sites, from values of 7.0 (+/- 0.6) microM and 143 (+/- 17) microM in 130 mM NaCl solution to values of 42 (+/- 3) microM and 660 (+/- 100) microM in 130 mM NaClO4 (pH 7.4, 24 degrees C). The half-saturating concentration of the Na+-binding sites on the E1 conformation was found to decrease from 8-10 mM in NaCl to 2.5-3.5 mM in NaClO4 solution. The rate of equilibration of the reaction, E1P(Na+)3 left arrow over right arrow E2P + 3Na+, decreased from 393 (+/- 51) s-1 in NaCl solution to 114 (+/- 15) s-1 in NaClO4. This decrease is attributed predominantly to an inhibition of the E1P(Na+)3 --> E2P(Na+)3 transition. The effects can be explained in terms of electrostatic interactions due to perchlorate binding within the membrane and/or protein matrix of the Na+,K+-ATPase membrane fragments and alteration of the local electric field strength experienced by the protein. The kinetic results obtained support the conclusion that the conformational transition E1P(Na+)3 --> E2P(Na+)3 is a major charge translocating step of the pump cycle. PMID:10388756

  10. An ab initio study of dissociative electron attachment to NaHCO3 and NaCO3, and the role of these reactions in the formation of sudden sodium layers

    Microsoft Academic Search

    B. Rajasekhar; John M. C. Plane

    1993-01-01

    One of the mechanisms that has been proposed to explain the phenomenon of sudden sodium layers (SSLs) in the upper atmosphere is dissociative attachment of electrons to sodium compounds such as NaHCO3 and NaCO3. In this study, abinitio calculations have been used to estimate the reaction enthalpies (?H°0(NaX + e? ? Na + X?)) for NaHCO3 and NaCO3, which are

  11. Swing curve measurement and simulation for high NA lithography

    NASA Astrophysics Data System (ADS)

    Bauer, J.; Haak, U.; Schulz, K.; Old, G.; Kraft, A.

    2006-03-01

    In this paper, we will present a new swing curve measurement and simulation method. Swing curve measurements were completed using a high NA KrF Scanner (Nikon S207D) where illumination and reflectance sensors were utilised to measure the reflectivity of the total wafer stack. With this new method, the influence of the full illumination NA ill (including effects of polarized illumination and immersion lenses), as well as the substrate properties can be taken into account. A new software has been developed to calculate the swing curve for a film stack of multiple layers on any given substrate, taking into account incident light integration over the whole aperture of the lithography tool objectives. The software also covers diffraction effects and their influences upon the swing. We will demonstrate, that with this new method, even mask diffraction effects can be described allowing a final and more accurate calculation and optimisation of the swing effect.

  12. Infrared reflectance spectra of Na2S with contaminant Na2CO3 - Effects of adsorbed H2O and CO2 and relation to studies of Io

    NASA Astrophysics Data System (ADS)

    Nash, D. B.

    1988-05-01

    A previously published IR reflectance spectrum of Na2S, a candidate surface component on Jupiter's satellite Io, showed a weak but distinct band at approximately 4.04 ?m that was interpreted as due to chemisorbed H2S or SO2. New spectra have been obtained on Na2S powder showing that this 4-?m band is not due to H2S or SO2, but rather Na2CO3, a contaminant present in the original material. Because of the extreme hygroscopic nature of Na2S, a reflectance spectrum of pure Na2S is not yet available. But the apparent high IR brightness of Na2S and the spectral neutrality in the range 1 - 5 ?m suggest that it could be a component on Io's surface.

  13. Intersubunit bridging by Na+ ions as a rationale for the unusual stability of the c-rings of Na+-translocating F1F0 ATP synthases.

    PubMed

    Meier, Thomas; Dimroth, Peter

    2002-11-01

    The oligomeric c-rings of Na+-translocating F1F0 ATP synthases exhibit unusual stability, resisting even boiling in SDS. Here, we show that the molecular basis for this remarkable property is intersubunit crossbridging by Na+ or Li+ ions. The heat stability of c11 was dependent on the presence of Na+ or Li+ ions. For equal stability, 10 times higher Li+ than Na+ concentrations were required, reflecting the 10 times lower binding affinity for Li+ than for Na+. In a recent structural model of c11, the Na+ or Li+ binding ligands are located on neighboring c-subunits, which thus become crossbridged by the binding of either alkali ion with a concomitant increase in the stability of the ring. Site-directed mutagenesis strengthens the essential role of glutamate 65 in the crossbridging of the subunits and also corroborates the proposed stabilizing effect of an ion bridge including aspartate 2. PMID:12393753

  14. Mutations in the human Na-K-2Cl cotransporter (NKCC2) identified in Bartter syndrome type I consistently result in nonfunctional transporters.

    PubMed

    Starremans, Patrick G J F; Kersten, Ferry F J; Knoers, Nine V A M; van den Heuvel, Lambertus P W J; Bindels, René J M

    2003-06-01

    Bartter syndrome (BS) is a heterogeneous renal tubular disorder affecting Na-K-Cl reabsorption in the thick ascending limb of Henle's loop. BS type I patients typically present with profound hypokalemia and metabolic alkalosis. The main goal of the present study was to elucidate the functional implications of six homozygous mutations (G193R, A267S, G319R, A508T, del526N, and Y998X) in the bumetanide-sensitive Na-K-2Cl cotransporter (hNKCC2) identified in patients diagnosed with BS type I. To this end, capped RNA (cRNA) of FLAG-tagged hNKCC2 and the corresponding mutants was injected in Xenopus laevis oocytes and transporter activity was measured after 72 h by means of a bumetanide-sensitive (22)Na(+) uptake assay at 30 degrees C. Injection of 25 ng of hNKCC2 cRNA resulted in bumetanide-sensitive (22)Na(+) uptake of 2.5 +/- 0.5 nmol/oocyte per 30 min. Injection of 25 ng of mutant cRNA yielded no significant bumetanide-sensitive (22)Na(+) uptake. Expression of wild-type and mutant transporters was confirmed by immunoblotting, showing significantly less mutant protein compared with wild-type at the same cRNA injection levels. However, when the wild-type cRNA injection level was reduced to obtain a protein expression level equal to that of the mutants, the wild-type still exhibited a significant bumetanide-sensitive (22)Na(+) uptake. Immunocytochemical analysis showed immunopositive staining of hNKCC2 at the plasma membrane for wild-type and all studied mutants. In conclusion, mutations in hNKCC2 identified in type I BS patients, when expressed in Xenopus oocytes, result in a low expression of normally routed but functionally impaired transporters. These results are in line with the hypothesis that the mutations in hNKCC2 are the underlying cause of the clinical abnormalities seen in patients with type I BS. PMID:12761241

  15. Talleres del primer cuatrimestre. Curso 2013-2014 LAS TARDES DE CINE. CINE EN VERSIN ORIGINAL EN EL MACA

    E-print Network

    Escolano, Francisco

    Talleres del primer cuatrimestre. Curso 2013-2014 1 LAS TARDES DE CINE. CINE EN VERSIÓN ORIGINAL EN: 88 min. #12;Talleres del primer cuatrimestre. Curso 2013-2014 2 12 de diciembre Un pez llamado Wanda MÍNIMA DEL 80% DEL TOTAL DE HORAS DEL CURSO *ESTAR AL CORRIENTE CON EL PAGO DEL CURSO *SUPERAR PRUEBA DE

  16. Na8Au9.8(4)Ga7.2 and Na17Au5.87(2)Ga46.63: The diversity of pseudo 5-fold symmetries in the Na-Au-Ga system

    NASA Astrophysics Data System (ADS)

    Smetana, Volodymyr; Corbett, John D.; Miller, Gordon J.

    2013-11-01

    The Na-rich part (~30% Na) of the Na-Au-Ga system between NaAu2, NaGa4, and Na22Ga39 has been found to contain the ternary phases Na8Au9.8(4)Ga7.2 (I) and Na17Au5.87(2)Ga46.63 (II), according to the results of single crystal X-ray diffraction measurements. I is orthorhombic, Cmcm, a=5.3040(1), b=24.519(5), c=14.573(3) Å, and contains a network of clusters with local 5-fold symmetry along the a-axis. Such clusters are frequent building units in decagonal quasicrystals and their approximants. II is rhombohedral, R3¯m, a=16.325(2), c=35.242(7) Å, and contains building blocks that are structurally identical to the Bergman-type clusters as well as fused icosahedral units known with active metals, triels and late transition elements. II also contains a polycationic network with elements of the clathrate V type structure. Tight-binding electronic structure calculations using linear muffin-tin-orbital (LMTO) methods on idealized models of I and II indicate that both compounds are metallic with evident pseudogaps at the corresponding Fermi levels. The overall Hamilton bond populations are generally dominated by Au-Ga and Au-Au bonds in I and by Ga-Ga bonds in II; moreover, the Na-Au and Na-Ga contributions in I are unexpectedly large, ~20% of the total. A similar involvement of sodium in covalent bonding has also been found in the electron-richer i-Na13Au12Ga15 quasicrystal approximant.

  17. The electroneutral Na+-(K+)Cl? cotransport family

    Microsoft Academic Search

    Steven C Hebert; Gerardo Gamba; Mark Kaplan

    1996-01-01

    The electroneutral Na+-(K+)-Cl? cotransport family. Recently the molecular identification of the major electroneutral sodium-potassium-chloride entry mechanisms present on apical membranes of distal nephron segments of the mammalian kidney, on basolateral membranes of many non-renal epithelial cells and on certain non-epithelial tissues has been achieved. These transporters represent a major pathway for cellular uptake of chloride critical for chloride absorptive and

  18. Protire?ivý vplyv WikiLeaks na diplomaciu

    Microsoft Academic Search

    Laura Meri?ková

    2012-01-01

    Cie?om práce je reagova? a prispie? k diskusii o zverejnení sto tisícky tajných depeší internetovým portálom Wikileaks, ktoré sa uskuto?nilo v roku 2010. ?lánok analyzuje dostupné názory a závery, ktoré prepája a na ich základe sa autor snaží zhodnoti?, aké dôsledky doposia? priniesla daná skuto?nos? v diplomacii ako i v spolo?nosti. ?alej autor využíva teoretické a empirické poznatky z odborných

  19. EFEITOS DA GEADA NA MADEIRA DE Eucalyptus saligna

    Microsoft Academic Search

    E. S. B. FERRAZ; A. R. COUTINHO

    RESUMO - Numa área de reflorestamento com Eucalyptus saligna com nove anos de idade foram selecionadas 235 árvores divididas em cinco classes de diâmetro, caracterizando toda a população. Segundo os registros meteorológicos, uma geada ocorreu no segundo ano ap6s o plantio. Procurou-se então verificar os efeitos da geada na madeira das árvores amostradas, procurando-se distinguir as dominantes das dominadas. As

  20. The local distribution of NA I interstellar gas

    Microsoft Academic Search

    B. Y. Welsh; N. Craig; P. W. Vedder; J. V. Vallerga

    1994-01-01

    We present high-resolution absorption measurements (lambda\\/Delta lambda approximately 75,000) of the interstellar Na I D lines at 5890 A toward 80 southern hemisphere early-type stars located in the local interstellar medium (LISM). Combining these results with other sodium measurements taken from the literature, we produce galactic maps of the distribution of neutral sodium column density for a total of 293